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
Each of the following can cause food poisoning except: 
Select and explain. 
A. Cl. difficile, B. Staphylococcus, C. Cl. welchii, D. Cl botulinum
A: Cl. difficile
Answer: A: Cl. difficile 
Explanation: None