This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Medicine
Treatment of choice for Hairy cell leukaemia ? 
Select and explain. 
A. IFNX, B. Splenectomy, C. Cladribine, D. None
C: Cladribine
Answer: C: Cladribine 
Explanation: Cladribine or 2-chlorodeoxyadenosine is a purine analogue that targets lymphocytes & selectively supress immune system.It is used to treat hairy cell leukaemia .Reference :Davidson's principles & practice of medicine 22nd edition pg no 1041.