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': "All of the following are true about mitral valve prolapse, except \nSelect and explain. \nA. Commonly associated with marfan's syndrome, B. Valve leaflets show myxomatous changes, C. Majority of cases present with mitral regurgitation, D. Also known as Barlow syndrome", 'role': 'user'}, {'content': 'Answer: C \nExplanation: MItral valve prolapse is generally asymptomatic.', 'role': 'assistant'}]