Do not give vague answers. Instead, think about something you did well and enjoyed that will be relevant at this new job. This is an opportunity for you to share your interests, prove that you are a great fit for the job and showcase your enthusiasm.

Good answer:

"I'm a people person. I was always happiest - and most satisfied - when I was interacting with patients, making sure I was able to meet their needs and giving them the best possible care. It was my favorite part of the job, and it showed - I was rated as "Good or Excellent" 95% of the time in peer reviews. Part of the reason I'm interested in this job is that I know I'd have even more interaction with patients, on an even more critical level."