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
[{'content': 'All are used in hairy cell leukemia except - \nSelect and explain. \nA. Steroids, B. Alpha interferon, C. Pentostatin, D. Splenectomy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]