The interviewer would like to know you apart from what is written on your CV and school transcripts. You are certainly not obligated to talk about personal matters like your relationship status, for instance. However, you want to share some interesting facts about yourself to show the interviewers at Indiana University School of Medicine that you have interests outside the classroom. According to the college's website, the IU interviewers are most interested in hearing about extracurricular activities, community service, research experience, and experience in environments that foster teamwork.
Your answer should be unique so that you are a memorable candidate! At the end of your response, remember to connect the factors you discuss and how they will ensure you are a hard-working medical student and future physician. For example, if you mention that you are a concert pianist, you can describe how your piano skills will benefit you nicely as a future surgeon.