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
Treatment of choice in hairy cell leukemia is: 
Select and explain. 
A. Steroid, B. Cladribine, C. Splenectomy, D. Pentostatin
B: Cladribine
Answer: B: Cladribine 
Explanation: Answer is B (Cladribine) "The treatment of choice is Cladribine Q (2 chlorodoxy adenosine) 0.14 mg /kg daily for 7 days" - CMDT This is a relatively non-toxic drug that produces benefit in 95% of cases, and complete remission in more than 80%