Which lymphoid organ is most involved in pathogen trapping?

Correct Answer: C

Rationale: Lymph nodes trap pathogens; spleen filters blood, thymus matures T cells, appendix is minor.

Correct Answer: C

Rationale: Neutrophils are granulocytes; lymphocytes and dendritic cells are agranulocytes, monocytes become macrophages.

Correct Answer: C

Rationale: Lymphocytes are agranulocytes; neutrophils , eosinophils , and basophils are granulocytes.

Correct Answer: B

Rationale: T cells mediate type IV (delayed); B cells are humoral, mast cells are type I, neutrophils are innate.

Correct Answer: C

Rationale: IFN-gamma boosts macrophages; IL-2 aids T cells, IL-4 helps B cells, IL-10 suppresses.