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': 'All of the following statements about Hairy cell leukaemia are true except - \nSelect and explain. \nA. Splenomegaly is conspicuous, B. Results from an expansion of neoplastic T lymphocytes, C. Cells are positive for Tartarate Resistant Acid phosphatase, D. The cells express CD25 consistently', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]