This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of lipid, Subject name: Biochemistry
[{'content': 'Unsaturated fatty acids are synthesized in the \nSelect and explain. \nA. Plasma membrane, B. Endoplasmic reticulum, C. Cytosol, D. Golgi complex', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most of the activity of these enzymes in the biosynthesis of triacylglycerols resides in the endoplasmic reticulum, but some are found in mitochondria.Ref: Harper&;s Biochemistry; 30th edition; Chapter 24; Metabolism of Acylglycerols & Sphingolipids', 'role': 'assistant'}]