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: Plasmacytoid lymphoma\n\nPlasmacytoid lymphoma, also known as plasmacytoid lymphocyte type malignant lymphoma, is a B cell neoplasm that is associated with plasmacytoid differentiation of lymphocytes.\nPlasmacytoid lymphocytes are transitional forms between lymphocytes and plasma cells.\nThese are low grade lymphoid neoplasms that occur in middle aged or older individuals.\nIn REAL classification, it is classified as lymphoplasmacytic lymphoma.\nThese may be associated with a monoclonal IgM paraprotein and are thus considered the histological counterpart of Waldenstrom's macroglobulinemia.", 'role': 'assistant'}]