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: Pathology
[{'content': 'Auer rods are seen in: \nSelect and explain. \nA. Acute myeloid leukemia., B. Chronic myeloid leukemia., C. Iron deficiency anaemia, D. Hodgkin’s disease.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Some of the commonly employed cytochemical stains, as an aid to classify the type of acute leukemia, are-\n\nMyeloperoxidase: positive in immature myeloid cells containing granules and Auer rods but negative in M0 myeloblasts.\nSudan black: Positive in immature cells in AML.\nPeriodic acid Schiff (PAS): Positive in immature lymphoid cells and in erythroleukemia (M6).\nNon-specific esterase (NSE): Positive in monocytic series (M4 and M5).\nAcid phosphatase: Focal positivity in leukemic blasts in ALL and diffuse reaction in monocytic cells (M4 and M5).', 'role': 'assistant'}]