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: Medicine
CD 19 positive, CD 22 positive, CD103 positive monoclonal B-cells with bright kappa positivity were found to comprise 60% of the peripheral blood lymphoid cells on flow cytometric analysis in a 55 year old man with massive splenomegaly and a total leucocyte count of 3.3 × 109/L. Which one of the following is the most likely diagnosis? 
Select and explain. 
A. Splenic lymphoma with villous lymphocytes, B. Mantle cell lymphoma, C. B-cell prolymphocytic leukemia, D. Hairy cell leukemia
D: Hairy cell leukemia
Answer: D: Hairy cell leukemia 
Explanation: None