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
QT prolongation is caused by:- 
Select and explain. 
A. Quinidine, B. Omeprazole, C. Lidocaine, D. Penicillin
A: Quinidine
Answer: A: Quinidine 
Explanation: Drugs causing QT prolongation are: Cisapride Astemizole Terfanidine Class 1A anti-arrythmic drugs: Quinidine, Procainamide. Class 3 anti-arrythmic drugs: Bretylium, Ibutilide