This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'All of the following can be used for the chronic oral treatment of arrhythmia except \nSelect and explain. \nA. Amiodarone, B. Esmolol, C. Quinidine, D. Verapamil', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Since the question mentions chronic treaqtment here esmolol is a beta blocking drug but with very sho half life hence cannot be used in chronic treatment of arhymias and route of administration is I.V. Ref: Katzung 12 th ed.', 'role': 'assistant'}]