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
Arsenic is useful in treatment of 
Select and explain. 
A. Acute promyelocytic leukemia, B. Myelodyplastic syndrome, C. Transient myelproliferative disorder, D. All of the above
A: Acute promyelocytic leukemia
Answer: A: Acute promyelocytic leukemia 
Explanation: 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