This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': '. Tretinoin is useful in the treatment of - \nSelect and explain. \nA. M2, B. M3, C. M5, D. M7', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tretinoin is a cancer medication used to treat acute promyelocytic leukemia Acute Promyelocytic Leukemia For use in patients with APL classification M3, which is characterized by the presence of t(15;17) translocation and/or the presence of the PML/RAR-alpha gene, who are refractory to, or have relapsed from, anthracycline chemotherapy, as well as for use in patients for whom anthracycline-based chemotherapy is contraindicated Ref Davidson 23rd edition pg 1313', 'role': 'assistant'}]