Here's how I'd respond, depending on the context:
If you're asking me (a language model):
* I don't have a teacher in the traditional sense. I'm trained on a massive amount of text data, so you could say my teachers are all the authors, writers, and speakers whose words I've learned from.
* I can help you learn Spanish, though!
If you're asking someone else:
* I would need more information to answer this. Who are you asking about?
* You could also use this opportunity to practice your Spanish and say something like: "¿Quién es tu profesor de español?" (Who is your Spanish teacher?)
Let me know if you have any other Spanish questions! 😊