Opsonization involves
A. marking a target for phagocytosis, and it is facilitated by interaction of the Fc region of the antibody with a phagocyte.
B. activation of NK cells, and it is a function of the antigen-binding site of the antibody.
C. cross-linking several antigens together so that they are no longer soluble, and it is facilitated by the Fc region of the antibody.
D. fixation of antibodies in the IgG and IgM classes, and it involves the antigen-binding site of the antibody.
Answer: A
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