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
All of the following statements about hairy cell leukemia are true except: 
Select and explain. 
A. 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
B: Results from an expansion of neoplastic T-lymphocytes
Answer: B: Results from an expansion of neoplastic T-lymphocytes 
Explanation: 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