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
Minerals which can generate free radical are all EXCEPT: 
Select and explain. 
A. Copper, B. Selenium, C. Cobalt, D. Nickel
B: Selenium
Answer: B: Selenium 
Explanation: Selenium helps in the scavenging of free radical as it is required for enzyme Glutathione Peroxidase (antioxidant). Transition metals like Iron, Copper, Cobalt, Nickel generate free radicals. Transition metals can react with superoxide radical to form hydroxyl radical Ferrous and Cuprous ions are more reactive than their oxidized counterpas i.e. ferric and cupric (Fe+3, Cu+2),Therefore these metals are never found in free state in body.