This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Emetic, 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[{'content': 'Cisapride was withdrawn from market due to?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: ANSWER: (A) QT ProlongationREF: Lippincott's 4th ed ch: 17See previous question for list of drugs causing QT prolongationInhibition of potassium channels widens the action potential, leading to a prolonged QT interval on the electrocardiogram. Such an effect is associated with increased risk of developing life-threatening ventricular tachyarrhythmias (torsades de pointes). The most common cause of QT prolongation is drug-induced, although it may also be genetic.", 'role': 'assistant'}]