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: Ans. is `b' i.e., IgM Plasmacytoid lymphoma Plasma cytoid lymphoma, also known as plasmacytoid lymphocyte type malignant lymphoma, is a B cell neoplasm that is associated with plasmacytoid differentiation of lymphocytes. Plasmacytoid lymphocytes are transitional forms between lymphocytes and plasma cells. o These are low grade lymphoid neoplasms that occur in middle aged or older individuals. o In REAL classification, it is classified as lymphoplasmacytic lymphoma. o These may be associated with a monoclonal IgM paraprotein and are thus considered the histological counterpa of Waldenstrom's macroglobulinemia.", 'role': 'assistant'}]