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
[{'content': 'A patient of myocardial Infarction dies after first few hours of infarction due to: \nSelect and explain. \nA. Ventricular fibrillation., B. Cardiac failure., C. Atrial fibrillation, D. Cardiac temponade.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Myocardial infarction occurs due to the formation of occlusive thrombus at the site of rupture of an atheromatous plaque in a coronary artery.\nSudden death from ventricular fibrillation or asystole, may occur immediately and many deaths occur within the first hour.\nDeath in those who survive the first few hours of infarction occurs due to cardiac failure.', 'role': 'assistant'}]