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
Fatty acids are not used by which organ - 
Select and explain. 
A. Heart, B. Liver, C. Muscle, D. Brain
D: Brain
Answer: D: Brain 
Explanation: Ans. is 'd' i.e., Brain