This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'The antiarrhythmic drug having effectiveness in a wide range of ventricular as well as supra–ventricular arrhythmias and acting mainly by prolongation of action potential is: \nSelect and explain. \nA. Quinidine, B. Amiodarone, C. Lignocaine, D. Tocainide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]