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': 'Which among the following  differentiates ventricular tachycardia  from WPW Patient with atrial fibrillation \nSelect and explain. \nA. Irregular RR interval, B. Regular RR interval, C. Broad QRS, D. Increased heart rate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: VT has regular RR interval.', 'role': 'assistant'}]