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': 'Plasmalogens belong to which group of compounds: \nSelect and explain. \nA. Phospholipid, B. Sphingolipids, C. Aminosugars, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: These compounds constitute as much as 10% of the phospholipids of brain and muscle. Structurally, the plasmalogens resemble phosphatidylethanolamine but possess an ether link on the sn-1 carbon instead of the ester link found in acylglycerols. Ref: Harper 28th edition, chapter 16.', 'role': 'assistant'}]