All characters of lingual tonsil except

Correct Answer: C

Rationale: Lingual tonsils are lined by stratified squamous epithelium, not pseudostratified (A is incorrect); adenoids refer to pharyngeal tonsils ; they have crypts and are non-capsulated (C is correct).

Correct Answer: A

Rationale: NK cells are innate immune cells from a lymphoid progenitor; they're not adaptive (C, D) and not myeloid-derived .

Correct Answer: B

Rationale: PRRs (pattern recognition receptors) recognize PAMPs and DAMPs as danger signals ; C is a subset, A and D are incorrect.

Correct Answer: A

Rationale: CD40L (on Th cells) prolongs DC survival ; binding , proliferation , and TCR activation are indirect or separate.

Correct Answer: B

Rationale: T cells are most abundant in the lamina propria for mucosal immunity; B cells , macrophages , and neutrophils are less dominant.