The interviewer wants to know what kind of books you prefer and why. Share with your interviewers what you are currently reading or the most recent book you've read. The interviewer asks this question to evaluate your interests and get a glimpse of your personality. At the end of the interview, they'll assemble your answers like pieces of a puzzle to construct a picture of who you are as a person. Even when all your answers are truthful, your choice of words or what you've chosen to share might paint an inaccurate picture of who you are. Be sure to keep your image as accurate and relevant to this pursuit as possible. After researching their institution, you'll understand what they're looking for. While answering your questions, see how you fit into their picture, and if it feels like a good fit for you, then that's the picture you want to paint for them.