question: Q:A 27-year-old man comes to the physician because of worsening abdominal pain over the last several months. He has also had recent feelings of sadness and a lack of motivation at work, where he is employed as a computer programmer. He denies suicidal thoughts. He has a history of multiple kidney stones. He has a family history of thyroid cancer in his father and uncle, who both underwent thyroidectomy before age 30. His temperature is 37°C (98°F), blood pressure is 138/86 mm Hg, and pulse is 87/min. Physical examination shows diffuse tenderness over the abdomen and obesity but is otherwise unremarkable. Serum studies show:
  Na+ 141 mEq/L
  K+ 3.6 mEq/L
  Glucose 144 mg/dL
  Ca2+ 12.1 mg/dL
  Albumin 4.1 g/dL
  PTH 226 pg/mL (normal range 12–88 pg/mL)
  Results of a RET gene test return abnormal. The physician refers him to an endocrine surgeon. Which of the following is the most appropriate next step in diagnosis?"? 
  {'A': 'Thyroidectomy', 'B': 'Urine metanephrines', 'C': 'Urine 5-HIAA', 'D': 'Midnight salivary cortisol', 'E': 'Serum gastrin'},