This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid & Electrolyte, Subject name: Medicine
[{'content': 'Aprindine is a ....... antiarrhythmic drugs: \nSelect and explain. \nA. IA, B. IB, C. IC, D. IV', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. IBAntiarrhythmic DrugsClass IaClass IbClass Ic1 Double Quarter Pounderwith Lettuce, Mayo & Tomatoand More Fries Please!DisopyramideLidocaineMoricizineQuinidineMexiletineFlecainideProcainamideTocainidePropefenoneClass IIClass IIIClass IVBeta blockers? LolThis is SADI and V in Class IV?PropranololSotalolDiltiazemAtenololAmiodaroneVerapamilMetoprololDofelitide', 'role': 'assistant'}]