LOL, I got that question. I said the first thing that came in to my head. Julia Roberts. I said that I remembered her in Erin Brokovich and how she was a woman who stood up for what she believed in. They asked me if I stand up for what I believe in. I said yes. It was all pretty cheesy, but I got in.
I think you can definitely overthink this one. Just pick someone and be able to give a reason (it doesn't have to be a particularly good reason). They are just seeing how you can think on your feet and if you can talk about something that isn't vet med.