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
Most common cause of sudden death 
Select and explain. 
A. Ventricular fibrilation, B. Atrial fibrilation, C. PSVT, D. A-V block
A: Ventricular fibrilation
Answer: A: Ventricular fibrilation 
Explanation: None