<prompt> Vegetations on undersurface of A.V. valves are found inAcute rheumatic feverLibman Sachs endocarditisNon thrombotic bacterial endocarditisChronic rheumatic carditis  <response>: Ref: R Alagappan - Manual of Practical Medicine 4th Edition.pg no:163 Endocarditis associated with SLE Libman-Sachs endocarditis: The vegetations are 3-4 mm in size, composed of degenerating valve tissue; functional disability is minimal; ventricular surface of the mitral valve is commonly involved; aoic valve involvement is rare; entire valve apparatus can be involved. 