question: Q:A 37-year-old woman comes to the physician because of a 2-week history of palpitations and loose stools. She has had a 2.3-kg (5-lb) weight loss over the past month. She has had no change in appetite. She has no history of serious illness. She works in accounting and has been under more stress than usual lately. She takes no medications. She appears pale. Her temperature is 37.8°C (100.1°F), pulse is 110/min, respirations are 20/min, and blood pressure is 126/78 mm Hg. Cardiopulmonary examination shows no abnormalities. The abdomen is soft and nontender. There is a bilateral hand tremor with outstretched arms and a palpable thyroid nodule in the left lobe. Serum laboratory studies show a thyroid stimulating hormone level of 0.03 μU/mL and a thyroxine level of 28 μg/dL. A radioactive iodine uptake scan shows enhancement in a 3-cm encapsulated nodule in the lower left lobe with decreased uptake in the remaining gland. Which of the following is the most likely diagnosis?? 
  {'A': 'Thyroid storm', 'B': 'Papillary carcinoma', 'C': "Graves' disease", 'D': 'Toxic adenoma', 'E': 'Goiter\n"'},