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': 'Plasmacytoid Lymphomas may be associated with: \nSelect and explain. \nA. IgG, B. IgM, C. IgA, D. IgE', 'role': 'user'}, {'content': "Answer: B \nExplanation: The pathological picture characterised by serum IgM paraproteinemia and pleomorphic infiltration of lymphocytes, abnormal plasma cells and intermediate cell forms in the bone marrow is termed as Plasmacytoid lymphocytic Lymphomas (Waldenstrom's Macroglobulinemia). Ref: Postgraduate Medical Journal, September 1981, Page 57, 588 - 591; Harrison's Principles of Internal Medicine, 16th Edition, Page 661.", 'role': 'assistant'}]