This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Chain, Subject name: Biochemistry
If FADH2 provides reducing equivalents to electron transport chain then ATP formed will be? 
Select and explain. 
A. 1.5, B. 2.5, C. 3.5, D. 4.5
A: 1.5
Answer: A: 1.5 
Explanation: ANSWER: (A) 1.5REF: Harper's 28 ed page 306See Biochemistry 2013 Session 2 for details of TCA/kerb cycleIf NAD H, provides reducing equivalents , then 2.5 ATP are producedIf FADH., provides reducing equivalents then, 1.5 ATP are produced