[ta752368]

> I bet if you point out the mistake, the LLM will say "oh you are right, this story actually does specify the gender of the doctor" or something to that effect... just like you or I would.

I tried this with Gemini 3 Pro Thinking model and it did correct itself afterwards. Also, it suggested that the boy may have two fathers in a same-sex relationship, which was pleasantly surprising. :)

# Prompt

A young man gets into an accident. The surgeon, after completing his preparations, says: ‘I can’t operate on him, he is my son.’ How is this possible?

## The Answer

The surgeon is the young man's *mother*.

### Why this is a riddle This is a classic example of a *lateral thinking puzzle* used to illustrate *unconscious bias*.

For decades, many people struggled to solve this immediately because their brains automatically associated the word "surgeon" with a man. Since the father was implied to be the one who brought the son in (or was incapacitated), the listener hits a logical block until they realize the surgeon could be a woman.

### Other Possibilities In the modern context, there is another valid answer: * The surgeon could be the young man's *other father* (in the case of a same-sex couple).

*Would you like to try another lateral thinking puzzle to test your perception?*

---

# Follow-up Prompt

Are you sure this is correct? I said "The surgeon, after completing *his* preparations"

## The Answer

You are absolutely right to catch that detail. My previous answer relied on the "classic" version of this riddle where the father dies in the accident.

Since you specified that the surgeon completed *his* preparations, the surgeon is male.

Here are the possible solutions based on your specific phrasing:

### 1. The Surgeon is his Father In this specific version of the prompt, you stated: "A young man gets into an accident." You *did not* state that the father was in the car or that the father died (which is a key detail in the traditional version of the riddle). Therefore, the surgeon is simply the young man's father, who was not involved in the accident.

### 2. The Surgeon is his Other Father If we assume the "spirit" of the riddle implies the biological father is unavailable or incapacitated (even if not explicitly stated), the young man has two fathers. The surgeon is his second father.

### 3. A Religious Figure The surgeon could be a priest or religious figure who refers to the young man as "my son" in a spiritual sense, though this is less likely to prevent a surgeon from operating than a familial bond.

*You caught me on the specific wording! Would you like to try a riddle where the wording is even more deceptive?*

[Mordisquitos]

Your second prompt was explicitly hinting Gemini towards what it had missed, highlighting the "his" rather than asking Gemini to double-check whether its first answer made sense without providing any clues:

> Are you sure this is correct? I said "The surgeon, after completing *his* preparations"

Furthermore, the second response you got from Gemini was actually smoking-gun evidence that the model isn't actually thinking. Note how, after Gemini has been clued to notice its mistaken assumption, its reevaluation remains anchored on the pointless idea that the surgeon may the young man's "Other" father.

What other father? There are only two characters in the prompt: the young man and a surgeon. In this situation, what on Earth is the difference between the young man's "Father" and the young man's "Other Father"? Evidently Gemini has no comprehension of the actual prompt and is incapable of critical reevaluation of its content, and rather will stick to its context window whether or not it makes sense.

[ta752368]

> What other father?

The model actually answered this in the first prompt answer:

### Other Possibilities In the modern context, there is another valid answer: * The surgeon could be the young man's other father (in the case of a same-sex couple).

[Mordisquitos]

Exactly, but only because in the first prompt under the mistaken assumption that a father died in the crash, it would make sense to refer to another father. However, no father died in any car crash in your modified "riddle", which didn't stop Gemini from being anchored to the context window even after you asked it to correct itself.

Put it this way. Imagine if in the original riddle, where a father died in the accident, the surgeon had made their familial relation explicit: the surgeon could have said ‘I can’t operate on him, he is my son. I am his mother’ or, in a modern context, ‘he is my son. I am his father’. Hence, there are indeed two possibilities: the surgeon is either the boy's mother or his [other] father.

Now lets take your revised version, with no implication of the young man having anyone else involved in the accident:

> A young man gets into an accident. The surgeon, after completing his preparations, says: ‘I can’t operate on him, he is my son. I am the boy's ${PARENTAL_RELATIONSHIP}.’

Do you think that, as Gemini stated, there are still two distinct possible solutions?

[ivell]

> In this situation, what on Earth is the difference between the young man's "Father" and the young man's "Other Father"?

Wouldn't it be correct to have two fathers in a child adopted by gay parents?

[Mordisquitos]

>Wouldn't it be correct to have two fathers in a child adopted by gay parents?

Having two fathers doesn't mean having a father and an "other father". It means having two fathers, in the same way that having two parents doesn't mean having a parent and an "other parent".

In the original riddle it makes sense to refer to "another father", but not in the revised version in which there is no mention of a father involved in the car crash.