question: Q:A 17-year-old girl is brought to the physician for the evaluation of fatigue for the past 6 months. During this period, she has had a 5-kg (11-lbs) weight loss. She states that she has no friends. When she is not in school, she spends most of her time in bed. She has no history of serious illness. Her mother has major depressive disorder. She appears pale and thin. She is at 25th percentile for height, 10th percentile for weight, and 20th percentile for BMI; her BMI is 19.0. Her temperature is 37°C (98.6°F), pulse is 65/min, and blood pressure is 110/70 mm Hg. Examination shows dry skin, brittle nails, and calluses on the knuckles. The remainder of the examination shows no abnormalities. Laboratory studies show:
  Hemoglobin 12.3 g/dL
  Serum
  Na+ 133 mEq/L
  Cl- 90 mEq/L
  K+ 3.2 mEq/L
  HCO3- 30 mEq/L
  Ca+2 7.8 mg/dL
  Which of the following is the most likely diagnosis?"? 
  {'A': 'Anemia', 'B': 'Milk-alkali syndrome', 'C': 'Anorexia nervosa', 'D': 'Major depressive disorder', 'E': 'Bulimia nervosa'},