question: Q:A 24-year-old woman comes to the physician because of a 2-month history of increased urination. She has also had dry mouth and excessive thirst despite drinking several gallons of water daily. She has a history of obsessive-compulsive disorder treated with citalopram. She drinks 1–2 cans of beer daily. Physical examination shows no abnormalities. Serum studies show a Na+ concentration of 130 mEq/L, a glucose concentration of 185 mg/dL, and an osmolality of 265 mOsmol/kg. Urine osmolality is 230 mOsmol/kg. The patient is asked to stop drinking water for 3 hours. Following water restriction, repeated laboratory studies show a serum osmolality of 280 mOsmol/kg and a urine osmolality of 650 mOsmol/kg. Which of the following is the most likely diagnosis?? 
  {'A': 'Primary hyperparathyroidism', 'B': 'Syndrome of inappropriate ADH secretion', 'C': 'Nephrogenic diabetes insipidus', 'D': 'Primary polydipsia', 'E': 'Beer potomania'},