<prompt> Arsenic is useful in treatment ofAcute promyelocytic leukemiaMyelodyplastic syndromeTransient myelproliferative disorderAll of the above  <response>: Refer Harrison 17th389 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 