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': 'Specific stain for myeloblasts is: \nSelect and explain. \nA. Sudan black, B. PAS, C. Myeloperoxidase (MPO), D. LAP', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Lymphoblast: PAS positive.\nMyeloblast: Sudan black, myeloperoxidase and non-specific esterase.\n\n\xa0“MPO is specific for myeloid differentiation. Sudan Black B reactivity is similar to MPO in myeloblasts and monoblasts. The specificity of Sudan Black is less than MPO.”', 'role': 'assistant'}]