Autoimmune disease occurs when​

A) ​the immune system loses its effectiveness.
B) ​T-cells are reduced by 90%.
C) ​malignant cells proliferate, producing a demand for numerous immune system responses.
D) ​the immune system attacks body cells rather than invaders.

Autoimmune Disease

Diseases where the immune system mistakenly attacks healthy cells in the body, leading to inflammation and tissue damage in various organs.

T-cells

A type of white blood cell that plays a central role in the immune system, helping to protect the body against infection and disease.

Malignant Cells

Abnormal cells that divide uncontrollably and have the potential to invade and spread to other parts of the body, indicating cancer.