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
If 1 NADH provides reducing equivalents to electron transport chain then how many ATP will be formed? 
Select and explain. 
A. 1.5 ATP, B. 2.5 ATPs, C. 3 ATPs, D. 1.5 ATP
B: 2.5 ATPs
Answer: B: 2.5 ATPs 
Explanation: 1 NADH = 2.5 ATPs
1 FADH2 = 1.5 ATPs