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
All of the following can be used for the chronic oral treatment of arrhythmia except 
Select and explain. 
A. Amiodarone, B. Esmolol, C. Quinidine, D. Verapamil
B: Esmolol
Answer: B: Esmolol 
Explanation: 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.