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
Plasmalogens belong to which group of compounds: 
Select and explain. 
A. Phospholipid, B. Sphingolipids, C. Aminosugars, D. None of the above
A: Phospholipid
Answer: A: Phospholipid 
Explanation: 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.