This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'All are true about endotoxins except: \nSelect and explain. \nA. Lipopolysaccharides in nature, B. Circulated in blood, C. Highly antigenic, D. Induces IL1 and TNF', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Highly antigenicEndotoxins are poorly antigenic and cannot be toxoided. Exotoxins are highly antigenic and can be toxoided.', 'role': 'assistant'}]