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
[{'content': 'Class III antiarrhythmic drug among the following is: \nSelect and explain. \nA. vernakalant, B. Phenytoin, C. Propafenone, D. Pindolol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Phenytoin is class IB, propafenone is class IC, pindolol is class II. class 3 - Amiodarone Sotalol Ibutilide Dofetilide Dronedarone Vernakalant REF.Essentials of Medical Pharmacology KD Tripathi 8th ed.', 'role': 'assistant'}]