A young man was going to join the army and had to take a medical examination. The doctor was sitting at a desk when he went in. He said to the man. "Take your coat and shirt off, and sit on the chair." The young man did so. The doctor looked at him for a moment without getting up from his chair and then said, "All right. Put on your clothes again." "But you haven't examined me at all!" the young man said in surprise. "There is no need to do so," the doctor said with a smile. "When I told you to take your coat and shirt off, you heard me all right, so there is nothing wrong with your ears. You saw the chair, so your eyes are good. You could take your clothes off and sit on the chair, so you must be in good health. And you understand what I told you to do and did it without a mistake, so you must be clever enough for the army." The young man went to the doctor because   _  .
he wanted to consult about his illness. he had to have a medical check-up. he did not want to join the army. he did not feel well.