This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acute Myelogenous Leukemia, Subject name: Pathology
[{'content': 'Pick the most likely subtype of leukemia associated with the following finding? \nSelect and explain. \nA. B cell ALL, B. AML-M3, C. AML-M4, D. AML-M5', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The cells show presence of rod like or needle like crystals called as AUER RODS Myeloblast: Has prominent nucleoli Surface markers- CD 33, CD 13, CD 15 Phi bodies derive from catalase-containing granules (microperoxisomes) Auer rods derive from peroxidase-containing (primary) granules. Like Auer rods, Phi bodies appear to be characteristics of immature myeloid cells in leukaemia Auer rods, distinctive needle-like azurophilic granules, are present in many cases; they are paicularly numerous in AML-M3 with the t(15;17) (acute promyelocytic leukemia).', 'role': 'assistant'}]