This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiac disorders, Subject name: Pathology
[{'content': "Calcification of aoic valve is seen in: \nSelect and explain. \nA. Hurler's syndrome, B. Marfan's syndrome, C. Syphilis, D. Hunter syndrome", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Calcification of aoic valve is seen in as a component of teiary syphilis causing an involvement of the cardiovascular system.', 'role': 'assistant'}]