Assertion: B lymphocytes leave the bone marrow and mature in the thymus gland.
Reason: Once mature, they accumulate in the same areas of T cells.
(a) Assertion and Reason are correct, Reason is the correct explanation of Assertion.
(b) Assertion and Reason are correct, Reason is not the correct explanation of Assertion.
(c) Assertion is correct, Reason is wrong.
(d) Both Assertion and Reason are wrong.
