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: Forensic Medicine
All are true of exotoxin, except: JIPMER 14 
Select and explain. 
A. Protein in nature, B. Antigenic, C. Heat stable, D. Highly toxic
C: Heat stable
Answer: C: Heat stable 
Explanation: Ans. Heat stable