A transplant recipient is more likely to reject a transplanted organ if there is not a close match between what of the recipient and that of the donor?

A. The presence of antibodies triggers the production of antigens: antibodies are produced in response to antigens, not the other way around.
B. Antibodies can be foreign cells, proteins, or other large molecules. Antigens are large proteins made by B cells: this reverses definitions: antigens are foreign molecules/cells that stimulate immune response; antibodies are proteins produced (by B cells) that bind antigens.
C. Antigens function to destroy or neutralize antibodies: antigens elicit antibody production; they do not act to destroy antibodies.
D. The presence of an antigen triggers the production of antibodies: antigens (foreign proteins, polysaccharides, cells) stimulate B cells to differentiate into plasma cells that produce specific antibodies.

A. Filter lymph: lymph nodes physically and biologically filter lymph, trapping pathogens and debris.
B. Immune surveillance: lymph nodes house lymphocytes and antigen-presenting cells that monitor for and respond to foreign antigens.
C. Produce macrophages: lymph nodes contain macrophages (and support their activity), but macrophages differentiate from monocytes in tissues; nodes are not typically described as producing macrophages de novo.
D. Filter blood: the spleen primarily filters blood; lymph nodes filter lymph, not systemic blood.