A、Doctor and patient. B、Teacher and student. C、Father and daughter. D、Coach and player. A女士很担心自己的身体，并说不知道为什么老是很虚弱；男士劝女士不用担心，让她多做

W: So, have you got the blood sample so we could do our genetic research?
M: I’m afraid we are in trouble. The people we’re testing have religious concern about the work we’re doing, so I couldn’t get the sample.
Q: What are the two speakers talking about?

W: I’ve been worried, and I don’t have a clue as to why I’ve been so sick.
M: Try not to worry too much. Do some exercise and see me next week. I’ll run some tests on you if you’re still not feeling well.
Q: What is the probable relationship between the two speakers?