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
All of the following features can differentiate between ventricular tachycardia and supraventricular tachycardia EXCEPT 
Select and explain. 
A. QRs < 0.14 seconds, B. Ventricular rate > 160/min, C. Variable first heart sound, D. Relieved by carotid sinus massage
B: Ventricular rate > 160/min
Answer: B: Ventricular rate > 160/min 
Explanation: None