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': 'Valve usually not involved in rheumatic fever - \nSelect and explain. \nA. Mitral, B. Aortic, C. Pulmonary, D. Tricuspid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Endocarditis\xa0in rheumatic\xa0fever\n1. Mitral valve involved almost all the cases of Acute Rheumatic\xa0Fever.\n2. Almost 25% of MR is associated with aortic regurgitation.\n3. Tricuspid regurgitation\xa0is seen in 10-30% cases.\n4. Pulmonary valve involvement is never seen.', 'role': 'assistant'}]