answer: Mr. Smith thanks to a doctor for treating his son. The doctor reminds him to keep his son away from seafood.
documents: #Person1#: I'm very grateful for what you have done to my son, doctor.
  #Person2#: That's all tight, Mr. Smith. That's my job. I'm very glad he recovered so soon.
  #Person1#: I know he has brought great trouble to you. A million thanks.
  #Person2#: No trouble at all. He's very cute and brave. By the way, do remember to keep him away from sea food for at least two weeks.
  #Person1#: I will. It's most thoughtful of you.