article: The story is about a young student.She worked very hard at her lessons.She worked so hard that she became ill.She couldn't go to sleep at night.But when she got up the next morning, she felt very tired.
  So she went to see a doctor.Hearing the student's words, the doctor said, "You are too stressed out.You must eat more yin foods like vegetables and tofu Besides , you can try to count numbers when you are lying in bed.By the time you count one thousand, you will be asleep .I'm sure of it."
  The next day, the student came to see the doctor again."Well," said the doctor, "How are you feeling today? "The student still looked tired."Not very well," she said." I tried to count one , two, three, four., up to one thousand.But when I counted five hundred and sixty, I felt sleepy.I had to get up and drink some coffee so that I could go on counting up to one thousand.But then I still couldn't be asleep.
question: What did the doctor ask the young student to do?
options: To eat more yin foods and count numbers when she was lying in bed in the evening. To exercise more in the morning. To do more reading. To take some medicine.