Not only are the interviewers interested in what drew you to apply to their university, but they're also curious to what extent you've familiarized yourself with what they pride themselves on offering. So this question serves somewhat as a personality assessment. By sharing with them what stands out to you about their university, they can gauge what you most identify with.
For example, the key competencies they provide their graduating students with are patient-centered practice knowledge, society and population health, health literacy and communication, interprofessional collaborative practice and leadership, professional and legal aspects of health care, health care finance and systems, cultural humility, and self-assessment and ongoing professional development.
By sharing this with them, they'll feel as if this was a memorable motive for your choice to apply to their school. You don't need to be an expert on their entire history but share with them the many aspects that stand out in your mind after performing adequate research on their university. Start by searching their website and take note of any recent news articles, events, or contributions they have made to the community or student body.