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
In oxidative phosphorylation, oxidetion of one NADH to NAD+produces how may ATPs: 
Select and explain. 
A. 5, B. 6, C. 4, D. 3
D: 3
Answer: D: 3 
Explanation: 3