question: Q:A 58-year old man comes to his physician because of a 1-month history of increased thirst and nocturia. He is drinking a lot of water to compensate for any dehydration. His brother has type 2 diabetes mellitus. Physical examination shows dry mucous membranes. Laboratory studies show a serum sodium of 151 mEq/L and glucose of 121 mg/dL. A water deprivation test shows:
  Serum osmolality
  (mOsmol/kg H2O) Urine osmolality
  (mOsmol/kg H2O)
  Initial presentation 295 285
  After 3 hours without fluids 305 310
  After administration of antidiuretic hormone (ADH) analog 280 355
  Which of the following is the most likely diagnosis?"? 
  {'A': 'Nephrogenic diabetes insipidus', 'B': 'Partial central diabetes inspidus', 'C': 'Complete central diabetes insipidus', 'D': 'Primary polydipsia', 'E': 'Osmotic diuresis'},