Which one of the following statements best describes the role of B cells and T cells in the human body?

Which one of the following statements best describes the role of B cells and T cells in the human body? (UPSC CSE 2022) 

1. They protect the body from environmental allergens.
2. They alleviate the body’s pain and inflammation.
3. They act as immunosuppressants in the body.
4. They protect the body from diseases caused by pathogens.

Answer: D

Explanation:

Option (d) is correct: The overall ability of the body to fight the disease causing organisms (pathogens), conferred by the immune system is called immunity. The primary and secondary immune responses are carried out with the help of two special types of lymphocytes present in our blood, i.e., B-lymphocytes (B-cells) and T-lymphocytes (T-cells). Thus, both B-cells and T-cells are responsible for acquired immunity. B-cells are responsible for antibody-mediated immunity response. T-cells are responsible for cell-mediated immunity response. B-cells produce antibodies to fight with the pathogens into our blood. The T-cells themselves do not secrete antibodies but help B cells produce them.

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