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 Paroxysmal Supraventricular Tachycardia \nSelect and explain. \nA. Digitalis, B. Adenosine, C. Adrenaline, D. Verapamil', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref: Katzung 14lh ed. pg. 246; KD Tripathi, 6th ed. pg. 509 & 518* Paroxysmal supraventricular tachycardia (PSVT) is sudden onset episodes of atrial tachycardia (rate 150-200/min) with 1:1 atrioventricular conduction* An attack of PSVT can be terminated by i.v. injection of verapamil, diltiazem, esmolol or digoxin; but most cardiologists now prefer adenosine.* Adenosine has a very short t1/2 in blood ( 10sec)* Almost complete elimination occurs in a single passage through coronary circulation.', 'role': 'assistant'}]