A substance–usually a protein–that the body recognizes as a foreign invader, triggering an immune response is an
A. antibody.
B. antigen.
C. antihistamine.
D. antibiotic.
Answer:B
A substance–usually a protein–that the body recognizes as a foreign invader, triggering an immune response is an
A. antibody. B. antigen. C. antihistamine. D. antibiotic.