This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Medicine
[{'content': 'Sudden death can be due to \nSelect and explain. \nA. Ventricular fibrillation, B. QT prolongation, C. Atrial flutter, D. VPCs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a (Ventricular fibrillation). (Ref. Harrison, Principles of Medicine, 18th/Chapter 233.)# Most common electrical mechanism of true cardiac arrest is ventricular fibrillation, responsible for 65-80% of cardiac arrests.# Episodes of cardiac arrest during Holter monitoring reveal that 3/4th of sudden deaths are due to VT/VF.# Treatment: Imparted cardioversion/defibrillator/amiodarone.VPCs in asymptomatic Young individual need no treatment.', 'role': 'assistant'}]