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
[{'content': 'Drug of choice for supraventricular tachycardia is: \nSelect and explain. \nA. Verapamil, B. Diltiazem, C. Digoxin, D. Phenytoin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) Verapamil(Ref: Katzung 11th/e p243-244, KDT 8th/e p580-581)*Adenosine is DOC for PSVT termination.*Verapamil is DOC for prophylaxis of PSVT and for management of sustained supraventricular tachycardia.', 'role': 'assistant'}]