This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Biochemistry
[{'content': 'Free radical with highest activity: \nSelect and explain. \nA. Hydrogen peroxide, B. Hydroxyl radical, C. Superoxide radical, D. Hydroperoxyl radical', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Oxygen Free Radical with highest activity which is most powerful is OH (hydroxy) radical.', 'role': 'assistant'}]