This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
The drug of choice in paroxysmal supraventrictalar tachycardia is - 
Select and explain. 
A. Digoxin, B. Adenosine, C. Nifedipine, D. Esmolol
B: Adenosine
Answer: B: Adenosine 
Explanation: None