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
Drug used in AV Block- 
Select and explain. 
A. Isoprenaline, B. Dopamine, C. adrenaline, D. Disopyramide
A: Isoprenaline
Answer: A: Isoprenaline 
Explanation: isoprenaline is a treatment that can be given in AV block before pacing electrode can be inseed. Ref Harrison 20th edition pg 1545