A substance that produces an immune reaction by its nature of being perceived as foreign to the body is a(n):
A) macrophage.
B) phagocyte.
C) antigen.
D) antibody.

Question

Quizplus · Accepted Answer

Antigens are substances that can trigger an immune response by being recognized as foreign by the body. Macrophages and phagocytes are types of immune cells that are involved in the immune response, but they do not produce an immune reaction simply by their nature of being perceived as foreign. Antibodies are proteins produced by the immune system that bind to specific antigens as part of the immune response.

A Substance That Produces an Immune Reaction by Its Nature