With regard to secondary lymphatic nodules: They are characterised by a 'darkly basophilic central region'.

Correct Answer: A

Rationale: The germinal center stains darkly basophilic due to dense lymphocyte populations with heterochromatic nuclei.

Correct Answer: D

Rationale: Lymph node capsule has smooth muscle at hilum , adipose tissue , and is pierced by afferent vessels ; it divides into cortex and medulla, but not regularly (D is incorrect).

Correct Answer: A

Rationale: Littoral cells line blood sinusoids in the spleen; Kupffer cells are in the liver.

Correct Answer: D

Rationale: Epithelial reticular cells have tonofilaments and desmosomes for structural support.

Correct Answer: A

Rationale: Thymus-dependent zone in spleen is the periarteriolar lymphatic sheath (PALS) around the central arteriole .