W: What's wrong with you? M: Nothing serious. W: Maybe you'd better have a medical examination. M: I think there is no need. I'm just having a cough and feel tired. W: You need to take an X-ray photo of your lungs. I advise you to do as I told you. After all, whatever work you want to do, you must have good health. Don't you think so? M: Thank you. But shall I make some calls to arrange some important business affairs first? W: OK., Question: What is the relationship between the two speakers? (A) Brother and sister. (B) Workmates. (C) Doctor and patient.
(B) Workmates.