This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lymphoma and Plasma cell disorder, Subject name: Medicine
[{'content': 'In lymphoplasmacytoid lymphoma which of the following monoclonal immunoglobulin is seen? \nSelect and explain. \nA. IgA, B. IgD, C. IgG, D. IgM', 'role': 'user'}, {'content': "Answer: D \nExplanation: Lymphoplasmacytoid lymphoma /Waldenstrom's Macroglobulinemia. The majority of patients in this disease have monoclonal IgM serum para-protein. In contrast to myeloma, the disease was associated with lymphadenopathy and hepatosplenomegaly,but the major clinical manifestation was the hyperviscosity syndrome.", 'role': 'assistant'}]