The thymus is a lobed organ located near the $...A...$ and beneath the $...B... $ The most appropriate combination for $\mathrm{A}$ and $\mathrm{B}$ is

Which of the following immune responses is responsible for rejection of kidney graft?

Assertion: Artificially acquired passive immunity results when antibodies or lymphocytes produced outside the host are introduced into a host.

Reason: A bone marrow transplant given to a patient with genetic immunodeficiency is an example of artificially acquired passive immunity.

Immunity tolerance developed by

Antigen binding site in an antibody is found between

Define : Autoimmunity