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
Least common valve involved in rheumatic fever is 
Select and explain. 
A. Aoic valve, B. Tricuspid valve, C. Mitral valve, D. Pulmonary valve
D: Pulmonary valve
Answer: D: Pulmonary valve 
Explanation: 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)