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
Magnesium is needed for the activity of which enzyme? 
Select and explain. 
A. Phosphatase, B. Aldolase, C. Dismutase, D. ATPase
D: ATPase
Answer: D: ATPase 
Explanation: None