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
b-Oxidation of odd-carbon fatty acid chain produces: 
Select and explain. 
A. Succinyl CoA, B. Propionyl CoA, C. Acetyl CoA, D. Malonyl CoA
B: Propionyl CoA
Answer: B: Propionyl CoA 
Explanation: Ans. B. Propionyl CoAb-Oxidation is the oxidation of carbon which is adjacent to a-carbon atom. It takes place in the mitochondria. b-Oxidation is accomplished by repetitive 4 steps to finally get Acetyl CoA (from even chain fatty acids) and propionyl CoA (from odd chain fatty acids). The four main steps are dehydrogenation, hydration, oxidation and thiolytic cleavage.