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
Calcification of aoic valve is seen in: 
Select and explain. 
A. Hurler's syndrome, B. Marfan's syndrome, C. Syphilis, D. Hunter syndrome
C: Syphilis
Answer: C: Syphilis 
Explanation: Calcification of aoic valve is seen in as a component of teiary syphilis causing an involvement of the cardiovascular system.