Dialogue:

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? 

- Brother and sister.

- Workmates.

- Doctor and patient.


Workmates.