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
All are true except ? 
Select and explain. 
A. Exotoxin has enzymatic action, B. Endotoxin has enzymatic action, C. Exotoxin is highly antigenic, D. Endotoxin is weakly antigenic
B: Endotoxin has enzymatic action
Answer: B: Endotoxin has enzymatic action 
Explanation: Ans. is 'b' i.e., Endotoxin has enzymatic action