Answer:
(b) Autoimmunity is an abnormal
immune response in which the immune system of the body starts rejecting its own
body cells or 'self cells and molecules. Sometimes, body loose its ability to
differentiate between pathogen or foreign molecules from self cell and attacks
self-cells. This results in damage to the body.
While if any foreign antigen enters into
body the lymphocytes because more active and produces more antibodies in its
response in the body.
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