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: Microbiology
[{'content': 'Complements synthesized in liver \nSelect and explain. \nA. C2,C4, B. C3,C6,C9, C. C5,C8, D. C1', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]