That's a fair critique, and pretty much what I said the first time I was asked to join the interviews to evaluate the answers.

Regardless, I do believe that being able to ask "how big is a golf ball" when you don't know is a crucial skill to possess, and I've found (anecdotally) that the people who threw their hands up, but were hired anyway, generally had poorer work performance because they either didn't know how to ask for help, or weren't willing to admit that they didn't know something.

Humility is a very good skill for any programmer I think.