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': 'The cofactor required for the activity of sulfite oxidase is: \nSelect and explain. \nA. Copper, B. Selenium, C. Molybdenum, D. Zinc', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Molybdenum', 'role': 'assistant'}]