This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non Hodgkin Iymphoma, Subject name: Pathology
[{'content': 'All of the following statements about hairy cell leukemia 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 a type of B-cell leukemia. Clinical feature: Massive splenomegaly Increase chances of infections DIAGNOSIS 1. BLOOD Pancytopenia Phase contrast microscopy- Hairy projections Staining- TRAP 2. Immunophenotyping CD11 + CD25+ CD103 + Annexin A1 + ( Best marker) 3.BM examination BM aspiration - Dry tap BM biopsy- Honey comb appearance - Fried egg appearance', 'role': 'assistant'}]