This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Torsade-de- pointes is caused by- \nSelect and explain. \nA. Hypermagnesemia, B. Metabolic acidosis, C. Hypomagnesemia, D. Metabolic alkalosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Torsades-de-pointes is a form of VT seen as a complication of prolonged ventricular repolarisation. It is seeen in hypomagnesemia. It is not seen in hypermagnesemia,metabolic acidosis,metabolic alkalosis Ref Harrison 20th ed pg 1436', 'role': 'assistant'}]