Which of the following is true about rheumatic fever

Answer- B. Chorea occurs in the absence of other manifestations after prolonged latent periodAcute rheumatic fever (ARF) is a multisystem disease resulting from an autoimmune reaction to infection with group A streptococcus.The endocardium, pericardium, or myocardium may be affected. Valvular damage is the hallmark of rheumatic carditisThe mitral valve is almost always affected, sometimes together with the aoic valve; isolated aoic valve involvement is rare.Early valvular damage leads to regurgitation.usually as a result of recurrent episodes, leaflet thickening, scarring, calcification, and valvular stenosis may develop.Therefore the characteristic manifestation of carditis in previously unaffected individuals is mitral regurgitation, sometimes accompanied by aoic regurgitation.