Kinds of innate immunity barriers are

Correct Answer: C

Rationale: Innate immunity includes both external barriers (skin, secretions, mucous membranes) and internal defenses (inflammatory response), making both A and B correct.

Correct Answer: C

Rationale: Activated T cells (e.g., cytotoxic T cells) target intracellular pathogens, like viruses in infected cells, not extracellular pathogens or mediators.

Correct Answer: A

Rationale: Lymphocytes (B and T cells) are not phagocytic, focusing on adaptive immunity, unlike neutrophils, dendritic cells, and macrophages.

Correct Answer: C

Rationale: Plasma cells, differentiated B cells, secrete large antibody quantities, unlike T cells or thymocytes (immature T cells).

Correct Answer: A

Rationale: CD4+ T cells (helper) recognize MHCII peptides, not MHC1 (CD8+) or cytosolic processing alone.