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: Biochemistry
Which of the following act as antioxidants: 
Select and explain. 
A. Glutathione peroxidase, B. Vit. C, C. Selenium, D. All
D: All
Answer: D: All 
Explanation: All Correct - A,B & C