question: Q:A 45-year-old woman with type 2 diabetes mellitus is brought to the physician because of a 3-week history of nausea, abdominal pain, and confusion. She has a history of gastroesophageal reflux disease treated with over-the-counter antacids. She does not smoke or drink alcohol. Her only medication is metformin. Her pulse is 86/min and blood pressure is 142/85 mm Hg. Examination shows a soft abdomen. Arterial blood gas analysis on room air shows:
  pH 7.46
  PCO2 44 mm Hg
  PO2 94 mm Hg
  HCO3- 30 mEq/L
  An ECG shows a QT interval corrected for heart rate (QTc) of 0.36 seconds (N = 0.40–0.44). The serum concentration of which of the following substances is most likely to be increased in this patient?"? 
  {'A': 'Parathyroid hormone', 'B': 'Thyroid stimulating hormone', 'C': 'β-hydroxybutyrate', 'D': 'Phosphate', 'E': '24,25-dihydroxycholecalciferol'},