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
'Which of the following is NOT used in treatment of hairy cell leukemia: 
Select and explain. 
A. Steroid, B. Pentostatin, C. Splenectomy, D. Alpha-interferon
A: Steroid
Answer: A: Steroid 
Explanation: Answer is A (Steroid) Steroid has no role in treatment of hairy cell leukemia. Cladribine is the drug of choice. Clinical complete remissions with cladribine occur in majority of patients and longterm disease free survival is frequent. Treatment of hairy cell leukemia is chemotherapy with Cladribine : Drug of choice. Alpha-interferon Q PentostatinQ