Question

lupus, a condition in which the body attacks its own cells, is an example of
an allergic disorder.
an immunodeficiency disorder.
a cancer of the immune system.
an autoimmune disorder.

Explanation:

• An allergic disorder involves an overreaction to external allergens (e.g., pollen, dust), not the body attacking its own cells. So the first option is incorrect.
• An immunodeficiency disorder is when the immune system is weakened or deficient, unable to fight infections properly, not attacking self - cells. So the second option is incorrect.
• A cancer of the immune system (like leukemia affecting immune cells) is abnormal cell growth of immune cells, not the immune system attacking its own cells. So the third option is incorrect.
• An autoimmune disorder is defined as a condition where the immune system mistakenly attacks the body's own healthy cells and tissues. Lupus fits this definition as the body attacks its own cells.

Answer:

D. an autoimmune disorder.