This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
The distinct neurotoxin produced by which Clostridia? 
Select and explain. 
A. Clostridium welchii, B. Clostridium tetani, C. Clostridium septicum, D. Clostridium oedematiens
B: Clostridium tetani
Answer: B: Clostridium tetani 
Explanation: (B) Clostridium tetani # Toxins: Cl. tetani produces at least two distinct toxins - a hemolysin (tetanolysin) and a powerful neurotoxin (tetanospasmin).> Two are antigenically and pharmacologically distinct & their production is mutually independent