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
All are true about endotoxins except: 
Select and explain. 
A. Lipopolysaccharides in nature, B. Circulated in blood, C. Highly antigenic, D. Induces IL1 and TNF
C: Highly antigenic
Answer: C: Highly antigenic 
Explanation: Ans. C. Highly antigenicEndotoxins are poorly antigenic and cannot be toxoided. Exotoxins are highly antigenic and can be toxoided.