This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'The following is an activator of LCAT \nSelect and explain. \nA. Apo AI, B. Apo E, C. Apo B 48, D. Apo B 100', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]