During a(n) the body's immune system acts against it's own antigens.
a) allergic response
b) rejection response
c) autoimmune response
d) immunodeficiency response

Answer : The correct answer for the blank is- C) autoimmune response.

When the immune system of the body fails to recognize "self" that is its own body tissue/own antigens, it produces antibodies against it.  

Due to this, the body's own cells, tissues, or organs are targeted, which cause inflammation and damage to the body. This condition develops as autoimmune response.

Example - Multiple sclerosis ( in which an insulation called myelin sheath around nerve fiber is destroyed that affects the transmission of nerve impulse, thereby causing problems related to muscular control).

cell regulation is conducted by special proteins.

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah