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: Medicine
The drug of choice for persistent unstable ventricular arrhythmia is- 
Select and explain. 
A. Procainamide, B. Calcium gluconate, C. Amiodarone, D. Digoxin
C: Amiodarone
Answer: C: Amiodarone 
Explanation: amiodarone is the drug of choice for persistent unstable ventricular arrythmias Ref Harrison 20th edition pg 1432