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
Which of the following is an exotoxin: NIMHANS 07 
Select and explain. 
A. E. coli toxin, B. Proteus, C. Pseudomonas, D. Tetanus toxin
D: Tetanus toxin
Answer: D: Tetanus toxin 
Explanation: Ans. Tetanus toxin