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
Glutathion synthetase requires ? 
Select and explain. 
A. Copper, B. Selenium, C. Magnesium, D. Iron
C: Magnesium
Answer: C: Magnesium 
Explanation: Magnesium RememberGlutathione synthetase requires --* MagnesiumGlutathione peroxidase contains -> Selenium