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: Medicine
Paroxysmal supra ventricular tachycardia responds to: 
Select and explain. 
A. IV verapamil, B. Valsalva manoeuvre, C. Carotid sinus massage, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans: dRef: Harrison, 16thed, p. 1347- 1348