Which term refers to autoimmune action against the body's own tissues?

• A. Autoimmunity
• B. Axillary
• C. Audiometry
• D. Auricle

Answer: (A)

Autoimmunity describes the immune system mistakenly targeting the body's own tissues. The term itself comes from auto- meaning self and immune meaning related to the immune response, so it directly names an immune action directed at self-tissues. That specificity is why it’s the right choice for “autoimmune action against the body's own tissues.”

The other terms don’t fit: axillary refers to the armpit area, often used for location descriptions of lymph nodes; audiometry is the test that measures hearing; auricle is the external part of the ear.