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
P : 0 ratio for FAD is - 
Select and explain. 
A. 3, B. 2.5, C. 1.5, D. 4
C: 1.5
Answer: C: 1.5 
Explanation: Ans. is 'c' i.e.,1.5The P : 0 ratio is a measure of the number of high energy phosphates (i.e., number of ATP molecules) synthesized per atom of oxygen consumed or per molecule of water is produced.The P : 0 ratio for oxidation of metabolites that yield NADH is 2.5 and the ratio for those that yield FADH2 is 1.5.