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': 'MC valve involved in Rheumatic fever ? \nSelect and explain. \nA. Mitral, B. Aoic, C. Pulmonary, D. Tricuspid', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Mitral Mitral valve is involved most commonly. o RHD is the most common cause of mitral stenosis.", 'role': 'assistant'}]