Fact 1: Active immunity results when an immune response to a pathogen produces memory cells. Fact 2: Pathogens are germs that cause disease. Given the two facts above, active immunity is when an immune response occurs after a germ produces what?

pick from the following.
(a). harmful substances.
(b). bioaerosols.
(c). rapid expansion.
(d). Allergies.
(e). anemia.
(f). it needs them.
(g). Chemical energy.
(h). memory cells.
Answer:
(h).