This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Pathology
True about primary CNS lymphoma - 
Select and explain. 
A. Reticulin staining is done, B. Essentially B cell type, C. Have an association with EBV, D. Indolent disease with good prognosis
A: Reticulin staining is done
Answer: A: Reticulin staining is done 
Explanation: Primary CNS Lymphoma Lymphomas in the brain may occur as a pa of disseminated non-Hodgkin's lymphoma or may be a primary CNS lymphoma. Primary CNS lymphoma has a poor prognosis. MORPHOLOGIC FEATURES. Grossly, the tumor is frequently periventricular in location and may appear nodular or diffuse. Microscopically, the features are as under: i) Characteristically, the tumor grows around blood vessels i.e. has an angiocentric growth pattern. Reticulin stain highlights this feature well. ii) Typically, CNS lymphomas are diffuse, large cell type with high mitotic activity. iii) They are generally b-cell type. Ref: TEXTBOOK OF PATHOLOGY 6th EDITION - HARSH MOHAN PAGE NO:889