This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': "Which of the following drugs can cause Torsades'de pointes ? \nSelect and explain. \nA. Quinidine, B. Lignocaine, C. Esmolol, D. Flecainide", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]