Question

which of the following is not part of the immune response?
a exposure to a pathogen
b production of antibodies by a lymphocytes
c phagocytosis of infectious agents
d stimulation of natural killer cells to destroy pathogens

Explanation:

Exposure to a pathogen is the start - point for an immune response. Phagocytosis by immune cells and activation of natural killer cells are part of the immune response. Antibodies are produced by B - lymphocytes, not A - lymphocytes.

Answer:

B. production of antibodies by A lymphocytes