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
The cofactor required for the activity of sulfite oxidase is: 
Select and explain. 
A. Copper, B. Selenium, C. Molybdenum, D. Zinc
C: Molybdenum
Answer: C: Molybdenum 
Explanation: Molybdenum