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': 'A 40 year old male patient is hospitalised with huge splenomegaly, marked sternal tenderness, and a total leucocyte count of 85,000 per cubic millimetre with large percentage of myeocytes and meta myelocytes, which one of the following drugs is best indicated for his disease ? \nSelect and explain. \nA. Cyclophosphamide, B. Chlorambucil, C. Melphation, D. Hydroxyurea', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]