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[{'content': 'Cisapride was withdrawn from market due to ? \nSelect and explain. \nA. QT Prolongation, B. Increased PR interval, C. Teratogenicity, D. Myocardial damage', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is'a'i.e., QT prolongation", 'role': 'assistant'}]