【单选题】

Questions 4 to 7 are based on the following conversation.At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation.

How does the man describe his health problemA．He gets ill at the same time every year.
B．He doesn’t get enough exercise.
C．He often has difficulty sleeping.
D．He’s sick with influenza throughout the winter.