question: Q:A 31-year-old female presents to the clinic with excessive anxiety and palpitations for a month. She also mentions losing of 2.72 kg (6 lb) of her weight over the last month. Her past medical history is insignificant. She does not smoke nor does she drink alcohol. Her temperature is 37°C (98.6°F), pulse is 81/min, respiratory rate is 23/min, and blood pressure is 129/88 mm Hg. On examination, mild exophthalmos is noted. Heart and lung examination is normal including cardiac auscultation. What is the most likely cause of her symptoms?? 
  {'A': 'Inadequate iodine in her diet', 'B': 'Thyroid stimulating antibodies', 'C': 'Medullary carcinoma of the thyroid', 'D': 'Lithium use', 'E': 'Use of propylthiouracil'},