This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lipoproteins, Subject name: Biochemistry
[{'content': 'Apolipoprotein that acts as enzyme activator: \nSelect and explain. \nA. Apo A-II, B. Apo C-II, C. Apo B-100, D. Apo E', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]