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
Number of ATPs produced from adipose tissue from 1 NADH (NAD+/ NADH) through respiratory chain: 
Select and explain. 
A. 0 ATP, B. 1 ATP, C. 2 ATP, D. 2.6 ATP
D: 2.6 ATP
Answer: D: 2.6 ATP 
Explanation: Ans : D (2.6 ATP) > and , .Because of these inequalities, the cellular reduction potentials of these two pyridine nucleotides are not equivalent, and under prevailing cellular conditions, the NADP+/NADPH couple is a much better electron donating system than the NAD/NADH couple. Because each NADH is worth 2.5-3 ATP, each NADPH can be assigned a value of 3.5-4 ATP.