Rh factor is: (A) IgM antibody, (B) Mucppolysaccharide, (C) IgG antibody, (D) Fatty acid
Answer is A. A i.e. IgM antibody - Rheumatoid (Rh) factor in rheumatoid ahritis is an autoantibody of IgM class directed against Fc fragment of IgGQ. - Antibodies (immunoglobins) are glycoproteins. And Rh factors is an autoantibody of any immunoglobin class directed against Fc fragment of IgG immunoglobin (Davidson).