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
[{'content': 'Multiple myeloma is a tumor of? \nSelect and explain. \nA. B-lymphocyte, B. T-lymphocyte, C. Lymph nodes, D. Plasma cell', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Plasma cell(Ref: Robbins 9th/pg 598-602)Multiple myeloma is a malignant proliferation of plasma cells derived from a single clone.', 'role': 'assistant'}]