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: Medicine
Among the toxins produced by clostridium botulinum the non-neurotoxic one is - 
Select and explain. 
A. A, B. B, C. C1, D. C2
D: C2
Answer: D: C2 
Explanation: None