Inference Listening Lesson - Pain in the Back

Who is the man talking to?

His doctor
His plumber
His teacher
His dentist

A: I'm afraid I have some bad news. We are going to have to do surgery.
B: How serious is my back?
A: If we do the surgery soon, you will make a full recovery.
B: What are we waiting for? Let's get the surgery started.
A: We still have to run a couple of more tests, but we should be scheduling the operation this week.