This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Anatomy
Lymphoplasmacytoid lymphoma is associated with: 
Select and explain. 
A. igG, B. igA, C. igD, D. igM
D: igM
Answer: D: igM 
Explanation: Lymphoplasmacytoid lymphoma is a B cell neoplasm presenting in 6th or 7th decade of life having feautures similar to CLL/SLL and multiple myeloma.Like MM there is presence of a M or monoclonal spike . Deletion involving chromosome 6q is the commonest abnormality in Waldenstroms macroglobulinemia.( ref 8th/65 9/e p601)