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': 'Longest T 1/2 is of which drug ? \nSelect and explain. \nA. Amiodarone, B. Quinidine, C. Diltiazem, D. Procainamide', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Amiodarone o Amiodarone is the longest acting antiarrhythmic.", 'role': 'assistant'}]