I was asked what I would do if I didn't get into med school this year. I'm wondering if they meant the question as a test to see how much I really want to go to med school.
Agreed, there are a lot ways to interpret this question, and the truth is that it's probably a combination of everything that you think it is. However, I have been told that the #1 point of the interview is for them to get to know who you are in a way that may not be represented on paper. Therefore, I would answer with what I really plan to do, if not accepted.
My interviewer asked me this question. I said "Cry." That got a chuckle out of her.
But then I went on to explain that because I have been employed at a hospital for a number of years, I have seen ways that I can contribute to health care, outside of being a physician. (Most notably, Pharmacy, Physician Assistant, or Nuclear Medicine.) I went on to explain that working with these individuals, I got a sense for their jobs and their commitment to health care, and that if my goal of becoming a physician goes unrealized, that I could still contribute to the well-being of a patient in one of these fashions.
I figured that was a pretty good answer, because it describes a sense of open-mindedness to other careers while at the same time reiterating a desire to help patients.
But that's my answer, so don't steal it.