i never subscribed to the whole don't tell them what specialty you want for my med school interviews, and i'd think that matters even less for residency. if you know you wanna focus on GU pathology or something like that, what harm is there in saying that? i would think there's a bigger risk in hiding the truth and the interviewer being able to tell (unless you're a really good liar, in which case, wanna teach me your skillz?) than in just telling the truth.
thanks yaah for the warning for those particular questions, although you're right that they're obviously things people should have good answers to. i'll keep it in mind for myself for next year.