This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biosynthesis of Fatty Acids and Eicosanoids, Subject name: Biochemistry
[{'content': 'Fatty acids are not used by which organ - \nSelect and explain. \nA. Heart, B. Liver, C. Muscle, D. Brain', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Brain", 'role': 'assistant'}]