According to this passage, which of the following is RIGHT（）

A．When you are in a state of subhealth, you should go to see a doctor and buy some medicine.
B．When you are in a state of subhealth, you should stay at home and keep silent.
C．When you are in a state of subhealth, you should find out the reasons and relax yourself.
D．When you are in a state of subhealth, you should have yourself examined in foreign countries.