This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lipids, Subject name: Biochemistry
Which of the following can be oxidized by b- oxidation pathway? 
Select and explain. 
A. Saturated fatty acids, B. Mono saturated fatty acids, C. Polyunsaturated fatty acids, D. All of these
D: All of these
Answer: D: All of these 
Explanation: Ans. D. All of theseb- oxidation is defined as the oxidation of fatty acids on the b- carbon atom. It is a characteristic feature of all the fatty acid. Even chain fatty acids are degraded to form Acetyl CoA and Odd chain fatty acids are degraded to form propionyl CoA. Due to the presence of double bonds in unsaturated fatty acids, there reactions are little bit different than saturated fatty acids. This is solved by the two additional enzymes- an isomerase and an epimerase.