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: Pharmacology
[{'content': 'Drug of choice for Hairy cell leukemia \nSelect and explain. \nA. Methotrexate, B. Gemcitabine, C. Cladribine, D. Decitabine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cladribine is a purine analogue, which is\xa0 DOC for Hairy cell leukemia.', 'role': 'assistant'}]