This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmias 1, Subject name: Medicine
In which condition can atrial fibrillation can degenerate into ventricular fibrillation? 
Select and explain. 
A. HOCM, B. Arrhythmogenic Right ventricular dysplasia, C. Pulmonary embolism, D. Wolf Parkinson white syndrome
D: Wolf Parkinson white syndrome
Answer: D: Wolf Parkinson white syndrome 
Explanation: In case of AF, the AV node exhibits decremental propey and controls the ventricular rate. WPW syndrome: Patient has a bypass tract (bundle of Kent) --> the impulses race down without any hindrance. Eg. if in AF ectopic foci are firing at 400 times per minute, the same impulses will pass down bundle of Kent and result in development of ventricular fibrillation.