This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arrhythmias, Subject name: Medicine
[{'content': 'Most common cause of sudden death - \nSelect and explain. \nA. Ventricular fibrillation, B. Atrial fibrillation, C. PSVT, D. A-V block', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Ventricular fibrillation Ventricular fibrillation is the most frequent mechanism of sudden cardiac death : - (accountsfor 60% of sudden death)o It is a rapid disorganized ventricular arryhthmia resulting in no uniform ventricular contraction, no cardiac output, and no recordable blood pressure.o Death from a ventricular tachyarryhthmia in the setting of an acute myocardial infarction has historically been one of the most frequent causes of sudden cardiac death.o 60% of the death associated with acute Ml occured within the first hour and were attributable to a ventricular arrhythmia.", 'role': 'assistant'}]