answer: Anna sees the doctor because of the painful backache, and the doctor gives her some pills.
documents: #Person1#: Hello, Anna. Come in and sit down.
  #Person2#: Hello, doctor.
  #Person1#: What's the matter?
  #Person2#: I've got a backache.
  #Person1#: Do you often suffer from backache?
  #Person2#: No, I don't. I've never had a bad one before.
  #Person1#: When did it start?
  #Person2#: About four days ago.
  #Person1#: Well, go home and rest in bed for two days, then you'll feel better.
  #Person2#: Can you give me some medicine? It's very painful.
  #Person1#: Yes, I'll give you some pills. Take one a time and three times a day, and come back in three days. If you don't feel. . .