This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
All the following reactions are involved in generation of reactive oxygen species within neutrophils for killing intracellular bacteria except 
Select and explain. 
A. Glutathione peroxidase, B. Superoxide dismutase reaction, C. Fenton's reaction, D. NADPH oxidase
A: Glutathione peroxidase
Answer: A: Glutathione peroxidase 
Explanation: Glutathione peroxidase catalyzes the destruction of hydrogen peroxide. Fenton's reaction generates hydroxyl radical from H2O2 Superoxide dismutase generates H2O2 from superoxide NADPH oxidase reaction generates superoxide from oxygen Reference: Harpers illustrated biochemistry 30th edition