With regard to the thymic medulla (ANAT2020 only): It is the site of B lymphocyte education.

Correct Answer: B

Rationale: B-lymphocyte education occurs in bone marrow; the thymic medulla is for T-cell maturation.

Correct Answer: A

Rationale: Carcinoma causes lymph node enlargement via metastatic spread from a primary site.

Correct Answer: D

Rationale: Palatine tonsils have non-keratinized epithelium , glands opening into crypts , and nodules ; they are non-capsulated but prone to inflammation (D is incorrect).

Correct Answer: C

Rationale: T-lymphocytes enter lymph nodes via post-capillary venules ; figure context suggests lymph node, not tonsil , spleen , or efferent entry .

Correct Answer: D

Rationale: Macrophages are part of innate immunity; T cells , antibodies , and B cells are components of adaptive immunity.