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
[{'content': "In Non-Hodgkin's lymphoma early involvement of bone marrow is typical of which variety ? \nSelect and explain. \nA. Diffuse, B. Nodular, C. Lymphocytic well differentiated, D. Lymphocytic poorly differentiated", 'role': 'user'}, {'content': "Answer: B \nExplanation: 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.", 'role': 'assistant'}]