Complement fixation is one of the most important host defense against infections. The complement is activated by;

Q. Complement fixation is one of the most important host defense against infections. The complement is activated by;

A.            IgM Only

B.            IgG only

C.            both IgM and IgG

D.            all five classes of antibodies activate complements. 

Answer: both IgM and IgG