Which cells are responsible for the immune response of the body?

The cells which directly attack and destroy the antigens are known as

Lymphocytes are sensitive to .........

Consider the following four statements $(i-iv)$ regarding kidney transplantation and select the two correct ones.
$(i)$ Even if a kidney transplant is successful,the recipient needs to take immunosuppressants for a long time.
$(ii)$ Cell-mediated immune response is responsible for the rejection of the graft.
$(iii)$ $B$-lymphocytes are responsible for the rejection of the graft.
$(iv)$ The acceptance or rejection of a transplanted kidney depends on specific interferons.

The grafting between two identical twins is known as

Which cells secrete interferons?