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': 'Platelet-activating factor is biochemically a \nSelect and explain. \nA. Prostaglandin, B. Glycolipid, C. Glycerol ether phospholipid, D. Leukotrienes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Platelet-activating factor (PAF) (I-alkyl-2-acetyl-sn-glycerol-3- phosphocholine) is synthesized from the corresponding 3-phosphocholine derivatives. It is formed by many blood cells and other tissues and aggregates platelets at concentrations as low as 10 mol/L.', 'role': 'assistant'}]