Question

the immune system attacks ______.

foreign materials

minerals like iron in your blood

your fats

your cells

Explanation:

The immune system's main function is to defend the body against foreign invaders (like pathogens) or foreign materials that are not part of the body's normal components. Minerals like iron in blood, fats, and normal body cells are not typically attacked by a healthy immune system (except in autoimmune disorders, but the question likely refers to normal function). So the correct option is the one about foreign materials.

Answer:

A. foreign materials