This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hypeension, Arrhythmias, Dyslipidemia, Subject name: Pharmacology
[{'content': 'QT prolongation is caused by:- \nSelect and explain. \nA. Quinidine, B. Omeprazole, C. Lidocaine, D. Penicillin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Drugs causing QT prolongation are: Cisapride Astemizole Terfanidine Class 1A anti-arrythmic drugs: Quinidine, Procainamide. Class 3 anti-arrythmic drugs: Bretylium, Ibutilide', 'role': 'assistant'}]