[krutulis]

Answering "In the context of an interview, [I get] frustrated because my default response to not knowing the answer to a question ... is to go out and research the problem [and I cannot do that in an interview]" is a nice response to not knowing an answer and would get bonus points for honesty and self-awareness.

The best candidates will recognize and comment on the ways in which frustration can be either constructive or destructive.

"This contrived situation is not one that applies to the average day in the workplace," is a serious over-generalization. Enormous amounts of code are written based on contrived beliefs about the way business does or should operate. The world would be much better off if programmers were better at recognizing and constructively commenting on these artificialities.

[tensor]

I personally think that "I would go out and research the problem" is the best answer. Introspection about response to feeling sounds like a huge waste of time and something best suited for people's psychiatrist.