question: Q:A 48-year-old woman underwent a thyroidectomy with central neck dissection due to papillary thyroid carcinoma. On day 2 postoperatively, she developed irritability, dysphagia, difficulty breathing, and spasms in different muscle groups in her upper and lower extremities. The vital signs include blood pressure 102/65 mm Hg, heart rate 93/min, respiratory rate 17/min, and temperature 36.1℃ (97.0℉). Physical examination shows several petechiae on her forearms, muscle twitching in her upper and lower extremities, expiratory wheezes on lung auscultation, decreased S1 and S2 and the presence of an S3 on cardiac auscultation, and positive Trousseau and Chvostek signs. Laboratory studies show:
  Ca2+ 4.4 mg/dL
  Mg2+ 1.7 mEq/L
  Na+ 140 mEq/L
  K+ 4.3 mEq/L
  Cl- 107 mEq/L
  HCO3-  25 mEq/L
  Administration of which of the following agents could prevent the patient’s condition?? 
  {'A': 'Anticonvulsants prior to and for 1 week after the operation', 'B': 'Magnesium sulfate intraoperatively', 'C': 'Vitamin D and ionic calcium prior to and 2 weeks after the operation', 'D': 'Calcium gluconate intraoperatively', 'E': 'Potassium supplementation prior to and 2 weeks after the operation'},