dialogue: M: How is your job doing, Jane? W: Great! I'm enjoying it a lot. The restaurant is really busy, and the tips are pretty good. M: I should come and have dinner sometime. W: Yes, why don't you? I will always welcome an old classmate. You will enjoy our food. I think it's best. M: OK! I will go tomorrow.
question: What is most probably their relationship?
choice: They are friends. They are classmates. They used to be colleagues.
answer: They are classmates.