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
[{'content': 'All of the following are class Ic anti-arrhythmic drugs except? \nSelect and explain. \nA. Propafenone, B. Tocainide, C. Enacainide, D. Flecainide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: CLASS I ANTI-ARRHYTHMICS Class Mechanism Drugs Ia Na+ and K+ channel blocker Quinidine Procainamide Ib Na+ channel blocker K+ channel opener Lignocaine Phenytoin Tocainide Ic Na+ Channel blocker Enacainide Flecainide Propafenone Tocainide: Class Ib anti-arrhythmic.', 'role': 'assistant'}]