This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
Class 3 antiarrhythmic drugs is 
Select and explain. 
A. Amiodarone, B. Phenytoin, C. Propafenone, D. Pindolol
A: Amiodarone
Answer: A: Amiodarone 
Explanation: Refer kDT 6/e p 511 Class III agents have the potential to prolong the QT interval of the EKG, and may be proarrhythmic (more associated with development of polymorphic VT). Class III agents include: bretylium, amiodarone, ibutilide, sotalol, dofetilide, vernakalant and dronedarone