This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Myeloma, Subject name: Medicine
[{'content': 'Russell body is found in: \nSelect and explain. \nA. WBC, B. RBC, C. Mast cells, D. Plasma cells', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. Plasma cellsInclusion body:a. Russell body (intracytoplasmic) found in plasma cellb. Dutcher body (nuclear)c. Inclusion of fibril crystalline Rods', 'role': 'assistant'}]