Question

what does immune surveillance refer to?
a the ability to patrol the body for foreign pathogens
b the ability to identify and eliminate tumors
c the ability to recognize and destroy foreign antigens
d the ability to activate the immune response when foreign particles enter the body

Explanation:

Immune surveillance is the immune system's function of identifying and eliminating abnormal cells like tumor - cells. It is not mainly about patrolling for foreign pathogens (a), recognizing and destroying foreign antigens (c) or activating immune response when foreign particles enter (d).

Answer:

B. the ability to identify and eliminate tumors