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
Which among the following  differentiates ventricular tachycardia  from WPW Patient with atrial fibrillation 
Select and explain. 
A. Irregular RR interval, B. Regular RR interval, C. Broad QRS, D. Increased heart rate
B: Regular RR interval
Answer: B: Regular RR interval 
Explanation: VT has regular RR interval.