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
Bacteria with potent exotoxin is 
Select and explain. 
A. Clostridium tetani, B. Pseudomonas, C. Shigella, D. Klebsielia
A: Clostridium tetani
Answer: A: Clostridium tetani 
Explanation: None