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
[{'content': 'Drug used in AV Block- \nSelect and explain. \nA. Isoprenaline, B. Dopamine, C. adrenaline, D. Disopyramide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: isoprenaline is a treatment that can be given in AV block before pacing electrode can be inseed. Ref Harrison 20th edition pg 1545', 'role': 'assistant'}]