Q.Autoimmuno disease is:

Autoimmunity occurs when the immune system fails to distinguish self from non-self and attacks the body's own tissues, producing autoantibodies and autoreactive cytotoxic T cells directed against the body's own molecules (autoantigens); when this produces disease, it is called an autoimmune disease. Autoimmune diseases are classified as organ-specific, where the attack targets mainly one organ (e.g. Hashimoto's thyroiditis and Graves' disease affecting the thyr …