This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'All of the following are mediators of acute inflammation except \nSelect and explain. \nA. Tumor necrosis factor _alfa, B. IL1, C. Myeloperoxidase, D. Prostaglandins', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ref Robbins 9/e p83 Myeloperoxidase (MPO) is a heme-containing enzyme that, in the presence of peroxide and halide ions, is effective in killing various microorganisms; in addition, it exes a wide variety of extracellular functions. Polymorphonuclear leukocytes (PMN) are the main source of this enzyme.', 'role': 'assistant'}]