This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'All-trans-retinoic acid is used in treatment of: \nSelect and explain. \nA. Acute promyelocytic leukemia, B. A.L.L., C. CML, D. Transient myeloproliferative disorder', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Arsenic trioxide (Trisenox) and all-trans retinoic acid (ATRA) are anti-cancer drugs that can be used alone or in combination with chemotherapy for remission induction of a ceain subtype of AML called promyelocytic leukemia. These drugs cause leukemia cells with a specific gene mutation to mature and die, or to stop dividing. REFERENCE: www.mayoclinic.org', 'role': 'assistant'}]