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: Ref: Harrison 17th/389,447 All-trans-retinoic acid is used in the treatment of acute promyelocytic leukemia.', 'role': 'assistant'}]