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: Pathology
[{'content': 'Reactive oxygen intermediates are released by: \nSelect and explain. \nA. Catalase, B. NADPH oxidase, C. Glutathione peroxidase, D. Superoxide dismutase', 'role': 'user'}, {'content': "Answer: B \nExplanation: Oxygen dependent killing is largely mediated through Reactive Oxygen Intermediates (ROI). The generation of reactive oxygen intermediates is due to the rapid activation of an oxidase, NADPH oxidase. Catalase, Superoxide dismutase and Glutathione peroxidase are radical scavenging enzymes that prevent oxygen mediated injury. Ref: Robbin's Illustrated Pathology, 7th Edition, Pages 16, 17, 60", 'role': 'assistant'}]