question: Q:A 45-year-old woman comes to the physician because of a 4-month history of irritability and frequent bowel movements. During this time, she has had a 6.8-kg (15-lb) weight loss. She has not had a change in appetite or diet. She takes no medications. Her temperature is 37.4°C (99.4°F), pulse is 112/min, respirations are 16/min, and blood pressure is 126/74 mm Hg. Examination shows moist palms. The thyroid gland is diffusely enlarged; there are no palpable nodules. Serum studies show a thyroid-stimulating hormone (TSH) concentration of 0.2 μU/mL, thyroxine (T4) concentration of 22 μg/dL, and antibodies against the TSH receptor. Which of the following treatment modalities is associated with the lowest rate of recurrence for this patient's condition?? 
  {'A': 'Subtotal thyroidectomy', 'B': 'Radioactive iodine ablation', 'C': 'Propranolol', 'D': 'Methimazole', 'E': 'Potassium iodide'},