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': 'Best Rx for CML is \nSelect and explain. \nA. Autologous BMT, B. Allogenic BMT, C. Alpha interferon, D. Hydroxyurea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]