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
Plasrnacytoid lymphomas may be associated with 
Select and explain. 
A. IgG, B. IgM, C. IgA, D. IgE
B: IgM
Answer: B: IgM 
Explanation: Plasmacytoid lymphoma is lymphoplasmacytic lymphoma.Its a B cell neoplasm in adults.Most commonly the plasma cell component secretes monoclonal IgM,often in amount sufficient to cause a hyperviscosity syndrome, Waldenstrom macroglobulinemia