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: Dental
[{'content': 'Which of the following is an important constituent of gram-negative microorganisms that contributes to initiation of the host inflammatory response? \nSelect and explain. \nA. Exotoxin, B. Lipoteichoic acid, C. Endotoxin, D. Peptidoglycan', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Endotoxin or lipopolysaccharide is an important constituent of the gram-negative outer membrane that contributes to initiation of the host inflammatory response.', 'role': 'assistant'}]