This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Beta oxidation of fatty acids, Subject name: Biochemistry
Which of the following is not a step of b-oxidation? 
Select and explain. 
A. NADP dependent oxidation, B. FAD dependent oxidation, C. Thiolysis, D. Hydration
A: NADP dependent oxidation
Answer: A: NADP dependent oxidation 
Explanation: 4 repetitive steps of fatty acid oxidation : 1. FAD dependent oxidation 2. Hydration 3. NAD dependent oxidation 4. Thiolysis It is NAD dependent oxidation, not NADP dependent