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': 'All are true except ? \nSelect and explain. \nA. Exotoxin has enzymatic action, B. Endotoxin has enzymatic action, C. Exotoxin is highly antigenic, D. Endotoxin is weakly antigenic', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Endotoxin has enzymatic action", 'role': 'assistant'}]