Question

which of the following statements regarding natural immunity is false?
a natural immunity includes receiving antibodies from the mother through the placenta.
b natural immunity does not require prior exposure to the pathogen.
c a good example of natural immunity is the macrophage.
d natural immunity mechanisms are not specific to any particular pathogen.

Explanation:

Receiving antibodies from the mother through the placenta is passive - acquired immunity, not part of natural (innate) immunity. Natural immunity is the body's first - line defense and is non - specific, present without prior pathogen exposure, and macrophages are part of it.

Answer:

A. Natural immunity includes receiving antibodies from the mother through the placenta.