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
[{'content': 'All the following features favour ventricular tachycardia as the cause of broad-complex tachycardia, except - \nSelect and explain. \nA. Fusion beats, B. Extreme left axis deviation, C. Very broad QRS complexes (> 140 ms), D. Non response to carotid sinus massage', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]