Official Answer Key & Detailed Solution
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Correct Answer: Option (D) — They protect the body from the diseases caused by pathogens.
Concept & Option Breakdown
Standard Reference VerifiedOption (d) is correct: B cells and T cells are the primary lymphocyte mediators of adaptive immunity. B cells provide humoral immunity by producing specific antibodies against pathogens, while T cells mediate cellular immunity by destroying infected host cells and regulating the immune response.
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