This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Selenium is an essential component of 
Select and explain. 
A. Glutathione synthetase, B. Glutathione peroxidase, C. Xanthine dehydrogenase, D. Cytochrome oxidase
B: Glutathione peroxidase
Answer: B: Glutathione peroxidase 
Explanation: .