If asked, is it OK to say that you don't feel that you have enough experience to say what field of medicine you are interested in going into during an interview?
If you really feel like you want to do something in particular, don't lie. That being said, it is good to mention that you have an open mind about the possibilities and are excited to see the various fields in more detail.
It is less what you say, and more how you say it.
Don't say cosmetic dermatology.
Adcomms are aware that statistically 80% of med students who matriculate knowing what they want to specialize in will change their minds. So it's a worthless question. If they ask it's probably more to see how you handle the question than because they really care about the answer. I think they'd prefer not to see that you don't have a rigid mindset, and are flexible and openminded.
I said cardiology because of my interest in the cardiovacular system but quickly talked about my interest now could change because I haven't seen everything and i am definitely open to the possibilities, using the interviewers specialty (which I couldn't of asked for a better specialty to delve into - pathology) as an example.Yeah, in my interview I was asked this question. Even though the reason I got into the field was because of my own eye surgery/problems and the laundry list of eye problems in my family, I still didn't want to say I was interested in ophtho.
So when asked, I bit my tongue, and said "I'm not really sure yet what part I want to do - there's just so much that I haven't seen yet." My interviewer went from a serious face to a smile and said:
"Of course you don't know what you want to do yet, that really was an unfair question."
Honestly I would play it safe and say you really aren't sure, but you liked the fields that you've seen, but don't have enough exposure to decide your career based on it. Responding with an answer that you want to go into a less popular field might backfire if they probe why.