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
[{'content': 'All are true about glutathione except? \nSelect and explain. \nA. It is a tripeptide, B. It converts hemoglobin to methemoglobin, C. It conjugates xenobiotics, D. It scavenges free radicals and superoxide ions', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]