The most avidly complement fixing antibody is -: (A) IgA, (B) IgG, (C) IgM, (D) IgE
Answer is B. IgG is the main serum immunoglobulin consisting of 80% of the total. equally distributed between intravascular and extravascular compaments. IgG paicipates in most immunological reactions such as complement fixation, precipitation a, d neutralization toxins and virus. REF:Anathanarayan & paniker's 9th edition, pg no:97 <\p>