A disease in which the immune system attacks "self' tissue is known as a(n) immunodeficiency.
primary immunodeficiency.
autoimmune disease.
secondary immunodeficiency​

Autoimmune disease

Explanation:

this occurs when the body's immune system attacks and destroys healthy body tissue by mistake. there are more than 80 types of Autoimmune disorders.

some examples include:lupus( an inflammatory disease caused when the immune system attacks its organs like your kidneys and heart)

another example is celiac disease ( when you have an immune reaction to gluten a protein found in wheat, barley, and rye. you can have bloating and low blood count).

I hope this helps if so please mark as Brainlist :) have a great day!!!

i think it is dna, i'm not totally sure but i think it might be.