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), not the body attacking its own cells. So the first option is incorrect.
• An immunodeficiency disorder is a weakened immune system (e.g., AIDS), where the body can't fight infections well, not attacking its own cells. So the second option is incorrect.
• Cancer of the immune system (like leukemia) involves abnormal cell growth in immune cells, not the immune system attacking the body's own cells. So the third option is incorrect.
• Autoimmune disorders occur when the immune system mistakenly attacks the body's own healthy cells and tissues. Lupus fits this definition as the immune system targets its own cells. So the fourth option is correct.

Answer:

D. an autoimmune disorder.