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 the following features favour ventricular tachycardia as the cause of broad-complex tachycardia, except - 
Select and explain. 
A. Fusion beats, B. Extreme left axis deviation, C. Very broad QRS complexes (> 140 ms), D. Non response to carotid sinus massage
C: Very broad QRS complexes (> 140 ms)
Answer: C: Very broad QRS complexes (> 140 ms) 
Explanation: None