This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Hydrogen peroxide is conveed to water and oxygen by enzyme? 
Select and explain. 
A. Superoxide dismutase, B. Catalase, C. Glutathione peroxidase, D. Myeloperoxidase
B: Catalase
Answer: B: Catalase 
Explanation: Catalase, present in peroxisomes, catalyzes the decomposition of hydrogen peroxide (2H2O2 - O2 + 2H2O). Glutathione (GSH) peroxidases are a family of enzymes whose major function is to protect cells from oxidative damage 2 GSH (glutathione) + H2O2 - GS-SG + 2 H2O. myeloperoxidase conves H2O2 to a highly reactive compound hypochlorite Superoxide dismutase conves superoxide into H2O2 ref robbins basic pathology 9th ed page 15