When's your interview? I didn't receive any tough questions about policies or ethics. I think the more meaningful (and difficult) questions that I was asked were:
"What do you think makes a good teacher? What about a good student? How do those qualities relate to being a doctor?"
"What would you tell yourself at the beginning of college to do differently or change? Why/how did you learn this?"
"How have you matured since graduating from college?"
These Qs may have just been unique to my interviewers, but from my impression, the interviewers are just looking to have a thoughtful, friendly conversation with you.