Would you please tell me a little about yourself?
This should be answered briefly and succinctly, and it should include why you want this position and the circumstances behind your leaving your current situation (they will want to know--and will ask if you don't say why).
"I come here a few years delayed as medicine wasn't my initial goal--I had gotten another degree. So I had to go back to acquire some of the pre-requisites for application to med school. However, once begun, I have been on track. I am married with one child. After finishing my residency, I joined the staff of the school for a year until I could decide where I wanted to go next. That brings me here."