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': "Most common site of rupture of aortic aneurysm in Marfan's syndrome is \nSelect and explain. \nA. Ascending aorta, B. Arch of aorta, C. Descending aorta, D. Abdominal aorta", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]