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': 'Complement components are: \nSelect and explain. \nA. Lipids, B. Proteins, C. Lipoproteins, D. Polysaccharide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Proteins', 'role': 'assistant'}]