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': 'Arsenic is useful in treatment of \nSelect and explain. \nA. Acute promyelocytic leukemia, B. Myelodyplastic syndrome, C. Transient myelproliferative disorder, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer Harrison 17th/389 AS2O3 promote the differentition of APL cells and promote apoptosis by upregulating the genes involved in apoptosis. It is used for the treatment of acute promyelocytic leukemia', 'role': 'assistant'}]