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': 'During the treatment of chronic myeloid leukemia, cytogenetic is least likely to occur with which one of the following modalities of treatment ? \nSelect and explain. \nA. Hydroxyurea, B. Imatinib mesylate, C. Interferon-alpha, D. Bone marrow transplantation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]