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: None', 'role': 'assistant'}]