Proliferation of lymphocytes occurs immediately after which events?

The question is incomplete as it does not have the options which are:

A) release from the bone marrow

B.) seeding of secondary lymphoid organs

C) entering the circulation

D) antigen encounter & activation

Answer:

D) antigen encounter & activation

Explanation:

The immune response of the body is determined by the immune cells flowing in the blood.

When a type of immune cell called lymphocytes interact with the antigen (foreign body), this induces the activation of the immune response.

A type of lymphocyte which flows in the blood is B-lymphocytes which contain antibodies and binds with antigen produces cytokines like IL-4,5. These cytokines induce the B cells to produce plasma cells and memory cells. The plasma cells produce more B lymphocytes.

Thus, Option-D is correct.