An Antigen Is ________, Whereas an Antibody Is ________

An antigen is ________, whereas an antibody is ________.

A) a foreign substance such as a protein or a polysaccharide to which lymphocytes respond; a globular protein that reacts with an antigen to eliminate the antigen
B) an immunoglobulin that is produced by lymph nodes in response to bacteria; a foreign protein that enters the body and causes an immune reaction
C) a hapten molecule that is complex in shape; an enzyme produced by the thymus gland that neutralizes antigens
D) only on a pathogen; only in a human body