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

1. A

   They protect the body from environmental allergens.

   Protect from environmental allergens. A slice of immunity (IgE), not the core B/T job as keyed.

2. B

   They alleviate the body's pain and inflammation.

   Alleviate pain and inflammation. That is drugs / other mediators.

3. C

   They act as immunosuppressants in the body.

   Act as immunosuppressants. Regulatory T cells modulate; they are not ‘the’ immunosuppressants.

4. D

   They protect the body from the diseases caused by pathogens.

   Protect from diseases caused by pathogens. Adaptive immunity: B cells (antibodies) and T cells (cellular).

Summary. Official key is (d). B lymphocytes and T lymphocytes are the adaptive immune cells that defend against pathogens. Allergen handling, analgesia and immunosuppression are not their defining role in this item.