This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
In Non-Hodgkin's lymphoma early involvement of bone marrow is typical of which variety ? 
Select and explain. 
A. Diffuse, B. Nodular, C. Lymphocytic well differentiated, D. Lymphocytic poorly differentiated
B: Nodular
Answer: B: Nodular 
Explanation: Ans. is 'b' i.e., NodularBone marrow involvement occurs in 85% of patients of follicular (nodular) lymphoma and characteristically takes the form of paratrabecular lymphoid aggregates.