听力原文：Patient: Aaaagh !
Dentist: But I haven't touched you yet. What are you shouting for？
Patient: You are going to touch me.
Dentist: Well, of course I am. How can I give you an injection without touching you. As soon as you've had the injection your gum will freeze and you won't feel a thing.
Patient: How do I know what you will do while I am asleep？ You might rob me.
Dentist: Now let's not be silly. You won't go to sleep. We don't do that nowadays. This will just freeze the area around the tooth so that you cannot feel any pain while I am pulling out the tooth. That is all. You won't go to sleep. You can watch everything in that mirror above you. Come along now.
What is the relationship between the two people？

A. Customer and assistant.
B. Teacher and student.
C. Doctor and patient.