Which one of the following statements best describes the role of B cells and T cells in the human body ?
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Answer: D. B cells and T cells are lymphocytes, the white blood cells of the adaptive immune system. B cells make antibodies and T cells kill infected cells and coordinate the response. Together they protect the body from diseases caused by pathogens.
Watch for: Allergies do involve B cells, which makes option A tempting, but their main job is fighting pathogens.
Why the other options are wrong
- A. Wrong because reacting to allergens is a side effect, not their main role.
- B. Wrong because they do not relieve pain and inflammation.
- C. Wrong because they activate immunity rather than suppress it.
Source to check: NCERT Class 12 Biology, Chapter 7 (Human Health and Disease), section on immunity
Answer from the official UPSC key. Written and fact-checked by AI against the official key. Spotted a mistake? Report it.