This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Which of the following is a peroxisomal free radical scavenger 
Select and explain. 
A. Superoxide dismutase, B. Glutathione peroxidase, C. Catalase, D. All the above
D: All the above
Answer: D: All the above 
Explanation: ref Robbins 9/e p48