A、Husband and wife. B、Salesman and customer. C、Doctor and patient. D、Employer and employee. C女士问男士哪里不舒服，男士回答了不舒服的症状，可见这是医生和病人的对话

M: You’re not looking very cheerful. What’s the matter with you?
W: Oh, nothing special. I’m just a bit fed up.
Q: What do we learn from the conversation?

W: Now, what seems to be the trouble?
M: It’s nothing serious. But I always have a headache, and I haven’t slept properly for several weeks. I’ve also lost appetite and my eyes are burning.
Q: What’s the probable relationship between the man and the woman?