This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pharmacology
All of the following drugs are used as oral treatment for arrhythmia except: 
Select and explain. 
A. Amiodarone, B. Esmolol, C. Quinidine, D. Verapamil
B: Esmolol
Answer: B: Esmolol 
Explanation: Ans. B. EsmololEsmolol is shortest acting beta blocker, it has to giveni/v for acute therapy. Rest of the drugs can be given via oral route.