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
[{'content': 'All are free radicals except \nSelect and explain. \nA. Superoxide, B. Hydrogen peroxide, C. peroxyl, D. Hydroperoxyl', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hydrogen peroxide is a reactive oxygen species but not a free radical because all electrons are paired. Clinical correlate: Chronic granulomatous disease also knows as Bridges-Good syndrome is due to deficiency of NADPH oxidase. The lysosomes are unable to produce hydrogen peroxide to kill the bacteria. The patients have increased susceptibility towards catalase-positive organisms. Reference: Harpers illustrated biochemistry 30th edition', 'role': 'assistant'}]