Q. In higher vertebrates the immune system can distinguish self cells from non -self ones. If this property is lost due to genetic abnormality and it attacks self cells it leads to :
(a) Allergic response
(b) Graft rejection
(c) Auto immune disease
(d) Active immunity
Solution : Correct option : C An autoimmune disease is a condition arising from an abnormal immune response to normal body tissue. In an autoimmune disease, the immune system fails to recognize self-cells and produces antibodies against self-cells. Common symptoms include low-grade fever and feeling tired. Autoimmune disease is due to genetic abnormality or other environmental factors.