<prompt> Auer rods are seen in:Acute myeloid leukemia.Chronic myeloid leukemia.Iron deficiency anaemiaHodgkins disease.  <response>: Some of the commonly employed cytochemical stains, as an aid to classify the type of acute leukemia, are-Myeloperoxidase: positive in immature myeloid cells containing granules and Auer rods but negative in M0 myeloblasts.Sudan black: Positive in immature cells in AML.Periodic acid Schiff PAS: Positive in immature lymphoid cells and in erythroleukemia M6.Non-specific esterase NSE: Positive in monocytic series M4 and M5.Acid phosphatase: Focal positivity in leukemic blasts in ALL and diffuse reaction in monocytic cells M4 and M5. 