This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Drug of choice for torsades de pointes? \nSelect and explain. \nA. Terfenadine, B. Quinidine, C. Isoprenaline, D. Magnesium sulphate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mg sulfate is used for prolonged QT syndrome or Torsades de pointes. Quinidine and terfenadine cause Torsades de pointesRef: Goodman Gillman 11th ed pg 929-930', 'role': 'assistant'}]