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
Free radical with highest activity: 
Select and explain. 
A. Hydrogen peroxide, B. Hydroxyl radical, C. Superoxide radical, D. Hydroperoxyl radical
B: Hydroxyl radical
Answer: B: Hydroxyl radical 
Explanation: Oxygen Free Radical with highest activity which is most powerful is OH (hydroxy) radical.