This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
[{'content': 'Least common valve involved in rheumatic fever is \nSelect and explain. \nA. Aoic valve, B. Tricuspid valve, C. Mitral valve, D. Pulmonary valve', 'role': 'user'}, {'content': "Answer: D \nExplanation: Endocarditis in rheumatic feverMitral valve involved almost all the cases of Acute Rheumatic FeverAlmost 25% of MR is associated with aoic regurgitationTricuspid regurgitation is seen in 10-30% of casesPulmonary valve involvement is never seen(Refer: Nelson's Textbook of Pediatrics, SAE, 1st edition, pg no. 1333 - 1335)", 'role': 'assistant'}]