I got asked the same thing, sort of, after I had already been accepted. The difference was they asked me what would I do if I didn't get in. I asked if they meant what alternative career path I would take and then they asked, no just that school. I responded that I was dedicated to medicine and would persue it at another school. I mean, did they expect me to camp out in front of their school and beg until they accepted me?!? That school was removed from contention in my mind--the whole interview just seemed so snobby/elist.