<prompt> An 8monthold female child presented to emergency with a heart rate of 220minute and features of congestive heart failure. Her heart rate comes down to normal after administering intravenous adenosine. What is the most likely diagnosis ?Atrial fibrillationAtrial flutterParoxysmal supraventricular tachycardiaVentricular tachycardia  <response>: Adenosine is the DOS for PSVT. 