This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Sphingolipids are chiefly accumulated in \nSelect and explain. \nA. Cardiac muscle, B. Adipose tissue, C. Skeletal muscle, D. CNS', 'role': 'user'}, {'content': 'Answer: D \nExplanation: CNS\n\nSphingolipids are mainly found in cell membranes, particularly nerve cells and brain tissues.', 'role': 'assistant'}]