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
True about exotoxin ? 
Select and explain. 
A. Non-antigenic, B. Enzymatic, C. Non-protein, D. Heat stable
B: Enzymatic
Answer: B: Enzymatic 
Explanation: Ans. is 'b' i.e., Enzymatic