question: Q:A 16-year-old boy is brought to the physician for a follow-up examination. He has a 6-year history of type 1 diabetes mellitus and his only medication is insulin. Seven months ago, he was treated for an episode of diabetic ketoacidosis. He has previously been compliant with his diet and insulin regimen. He wants to join the high school soccer team. Vital signs are within normal limits. His hemoglobin A1C is 6.3%. Which of the following is the most appropriate recommendation at this time?? 
  {'A': 'Advise against physical activity', 'B': 'Lower insulin dosage on days of exercise', 'C': 'Switch from insulin to metformin', 'D': 'Increase insulin dosage on days of exercise', 'E': 'Limit activity to 20 minutes per day'},