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': 'Apoprotein of cholesterol is: \nSelect and explain. \nA. Apo Al, B. ApoA2, C. Apo Cl, D. ApoE', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Apolipoprotein E is a plasma protein that serves as a ligand for low density lipoprotein receptors and, through its interaction with these receptors, paicipates in the transpo of cholesterol and other lipids among various cells of the body.', 'role': 'assistant'}]