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 produced by spleen \nSelect and explain. \nA. C1, B. C2, C4, C. C5, C8, D. C3, C6', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C1\xa0-Intestinal epithelium\nC2, C4 - Macrophages\nC5, C8 - Spleen\nC3, C6, C9 - Liver.', 'role': 'assistant'}]