<prompt> Least common valve involved in rheumatic fever-Aortic valveTricuspid valveMitral valvePulmonary valve  <response>: Ans. is d i.e., Pulmonary valve Endocarditis in rneumatic feverMitral valve involved almost all the cases of Acute Rheumatic Fever.Almost 25 of MR is asociated with aortic regargitation.Tricuspid regurgitation is seen in 10-30 cases.Pulmonary valve involvement is never seen. 