[ugh]

Everyone seems to forget that Watson would never have answered Toronto if it didn’t have to. It wasn’t at all confident, you can’t even really say that it made a mistake. It just didn’t know the answer and was – correctly so – very sure that it didn’t know the answer.

[Jach]

Excellent point. But that "Toronto" was its highest guess makes you wonder if it could confidently select something that exploits whatever errors led to Toronto. And if you asked it a medical question, would it say "I don't know?" if it wasn't confident or would it give an answer anyway (along with a confidence level that might be ignored or rationalized away)?