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: Pharmacology
A sixteen–year–old girl is found to have paroxysmal attacks of rapid heart rate. The antiarrhythmic of choice in most cases of acute AV nodal tachycardia is: 
Select and explain. 
A. Adenosine, B. Amiodarone, C. Propranolol, D. Quinidine
A: Adenosine
Answer: A: Adenosine 
Explanation: None