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': 'The drug of choice in paroxysmal supraventricular tachycardia is- \nSelect and explain. \nA. Digoxin, B. Adenosine, C. Nifedipine, D. Esmolol', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref Harrison 20th edition pg 1536', 'role': 'assistant'}]