How to handle boy or girl question?

Hello fellow non-binary substitutes! How do you handle it when students ask you if you are a boy or girl? My go to is to say I’m a teacher but I was wondering if y’all have any other ways of handling it.

I introduce myself as “Substitute Last Name”. The subbing agency I work for says I’m not allowed to explain they/them pronouns (nor do I think I want to considering the current political climate).