This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc. (W.B.C), Subject name: Pathology
Lymphoplasmacytoid lymphomas may be associated with 
Select and explain. 
A. IgG, B. IgM, C. IgA, D. IgE
B: IgM
Answer: B: IgM 
Explanation: Ans. (b) IgM(Ref: Robbins 9th/pg 598-602)Lymphoplasmacytic cell proliferation in marrow (Lymphoplasmacytic lymphoma) with secretion of IgM