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': 'The major lipid of the lipoproteins is: \nSelect and explain. \nA. Oleic acid, B. Palmitic acid, C. Linoleic acid, D. Arachidonic acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Arachidonic acid', 'role': 'assistant'}]