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: Pharmacology
[{'content': 'Arsenic is useful in the treatment of : \nSelect and explain. \nA. Acute promyelocytic leukemia, B. Myelodysplastic syndrome, C. Transient myeloproliferative disorder, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]