This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': "'Hairy cell leukemia' is a neoplastic proliferation of- \nSelect and explain. \nA. T.cells, B. B.cells, C. Myeloid cells, D. Macrophages", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]