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
All of the following are mediators of acute inflammation except 
Select and explain. 
A. Tumor necrosis factor _alfa, B. IL1, C. Myeloperoxidase, D. Prostaglandins
C: Myeloperoxidase
Answer: C: Myeloperoxidase 
Explanation: 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.