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: Medicine
[{'content': 'A 42 -year old man was referred with a 2-week history of fever weakness and bleeding gum. Peripheral smear showed pancytopenia. The bone marrow examination revealed 26% blasts frequently exhibiting Auer rods and mature myeloid cells. An occasional neutrophil with pseudo-Pelger-Huet anomaly was also noted: Which of the following cytochemical stains is most likely to be positive? \nSelect and explain. \nA. Acid phosphatase, B. Non specific esterase, C. Myeloperoxidase, D. Toluidine blue', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]