The antibody that constitutes about 80% of circulating ones in plasma is IgG. The correct option is A.
An antibody, also recognized as an immunoglobulin, is a huge, Y-shaped protein that the immune system utilizes to recognize and neutralize foreign objects like pathogenic bacteria and viruses.
The antibody acknowledges an antigen, which is a unique molecule of the pathogen.
Antibodies work to eliminate disease-causing organisms like viruses or bacteria as well as block these from infecting human cells.
IgG is the most plentiful circulating antibody, accounting for 80% of total antibodies and 75% of antigens found in serum.
Thus, the correct option is A.
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