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': 'The most common cause of death in patients in Marfan syndrome patients is \nSelect and explain. \nA. Annuloaoic ectasia, B. Mitral valve prolapse, C. Aoic dissection, D. Abdominal aoic aneurysm rupture', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Between 75% and 85% of patients with the Marfan syndrome have dilatation of the ascending aoa and annuloaoic ectasia (dilatation of the aoic sinuses and annulus). Such aoic abnormalities are the most common cause of death among patients with Marfan syndrome ref - Harrisons 20edition pg1918,2975,829', 'role': 'assistant'}]