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: Medicine
[{'content': "Most common plasma cell tumor is - \nSelect and explain. \nA. Plasmacytoma, B. Waldenstorm's macroglobinemia, C. Multiple myeloma, D. Primary amyloidosis", 'role': 'user'}, {'content': "Answer: C \nExplanation: Multiple myeloma is a malignant proliferation of plasma cells. In multiple myeloma,plasma cells produce immunoglobulin of a single heavy & light chain,a monoclonal protein commonly referred to as paraprotein.In some cases,only light chain is produced & this appears in the urine as Bence Jones protein .Reference:Davidson's principles & practice of medicine 22nd edition pg no 1046.", 'role': 'assistant'}]