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 III antiarrhythmic drug among the following is: 
Select and explain. 
A. vernakalant, B. Phenytoin, C. Propafenone, D. Pindolol
A: vernakalant
Answer: A: vernakalant 
Explanation: 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.