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 Taarate Resistant Acid Phosphatase, D. The cells express CD25 consistently', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hairy cell leukemia is an uncommon B cell lymphoproliferative disorder. It constitute 2% of all forms of leukemia. Median age of occurrence is 55years. Male to female ratio is 4.5:1. Most patients are asymptomatic and are diagnosed following an incidental finding of spleenomegaly or cytopenia. Some can present with fatigue, weakness, weight loss and occasionally fever and night sweats. Ref: Oxford Desk Reference Oncology By Thankamma V. Ajithkumar, Page 486', 'role': 'assistant'}]