Someone has already posted that when he got asked this question - he was completely honest and said that he does not read books (i.e., novels) and that he was still accepted. He mentioned something along the lines - the interview is a chance to get to KNOW you and how you interact with others - are you well spoken, are you confident, are you pleasant, aggressive, passive, shy, etc.
If you come off as arogant or being too confrontational when challenged - this is not good.
If you get caught lying, this is not good. If you are insincere, this is no good.
Everything else, such as the correct answers - you need not worry. I know people who have been asked about their opinions on the health minister's policy - they didn't know who the minister was nor the policy...WOW, they must be living in hole with no life other than academics. They got accepted.
Listen, if you get asked a question on a topic that you are not familiar with (such as reading) - it's not a bad thing, don't worry about it - be honest. Do not try and contrive an answer to try and impress the interviewer. You don't need to read novels to be well-rounded...I know many people, myself included, who are well-rounded but who do not read novels regularly. I also know people who read novels and they are complete pr*cks - so what does this mean?
Alright, so don't worry. They just want to see that
First: You got a good head.
Second: You got a good heart.
After that, you can't paint a picture of a typical medical professional:
some people are gay, some people are straight, some people are religious, some do not believe in god, some have liberal views, some are neo-conservative bush loving islam hating racists (sdn users i've encountered), some read books, others play x-box360, some go fishing, others go white water rafting, some can speak perfect english, others are ESL, some are Americans, some are Canadians who are obviously going to go back to Canada to practice, some are Americans who are obviously going back to the US to practice....all these different types of people get into US and Canadian medical schools.
Do you honestly think that medical school admissions sorts through all the applicants and only admits those who are liberal, open-minded, and "well-rounded??" Not so - I know someone, the biggest misogynist I know, who started off university as anti-sinic, who is now anti-semitic (and vocal about it) - and he's in medical school. His social skills were poor as well. This didn't stop him from gaining admission to a top canadian medical school (as in ranked by maclean's as #1 for last several years).
Do you think that diversity only pertains to ethnicities???
People do not have to "do" the same things as "YOU" or the things that "YOU believe - and what a segment of society believes to be trait enhancing activities" in order to be well-rounded.