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
Which of the following minerals does not act as prosthetic group in enzymes? 
Select and explain. 
A. Copper, B. Cobalt, C. Selenium, D. Manganese
D: Manganese
Answer: D: Manganese 
Explanation: None