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: Pathology
[{'content': "Calcification of the aoic valve is seen in - \nSelect and explain. \nA. Aoic stenosis, B. Aoic regurgitation, C. Marfan's syndrome, D. Hurler's syndrome", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Aoic Stenosits The most frequent calcific valvular diseases are ? Calcific aoic stenosis Calcification of a congenitally bicuspid aoic valve. Mitral annular calcification", 'role': 'assistant'}]