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
[{'content': 'Principle building block in fatty acid synthesis: \nSelect and explain. \nA. Acetyl CoA, B. Palmitoyl CoA, C. Malonyl CoA, D. Oleate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Acetyl CoA* Principle building block in fatty acid synthesis: Acetyl CoA* Cofactors required: NADPH, ATP, Mn2+ and HCO3 * Source of Acetyl CoA: From mitochondria (after aerobic glycolysis and Fatty acid oxidation)* Site of FA synthesis: Liver, Kidney, Brain, Lungs, Adipose tissue, Lactating breast # Organelle: Extra-mitochondrial system in cytosol* Enzyme:# Acetyl CoA carboxylase-rate limiting enzyme# Fatty acid synthase', 'role': 'assistant'}]