Ehhh, I’d personally be careful about it. They want you to talk about someone you know outside of veterinary medicine. While I think that you can certainly have valid reasons for wanting to pick this mentor, I think they’re still in the sphere of veterinary medicine.
I’d choose someone else.
Ultimately you can try to swing it that way but I’d strong advise against it. It can be anyone who’s had a significant effect on your life…. They want to see about what’s important to you outside of veterinary medicine. Write about friends, family, or about someone out there making a difference in the world. I wrote about a seventh grader I know and am very close with and what makes her amazing.
ETA: I think you should assess how a potential reader might see this- one may read it and shake their head but let it slide, someone else may say you didn’t answer the prompt. While the former might still mean you advance to another review stage, neither are responses you’d want from a reviewer of your app.