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
A preformed toxin is important in food poisoning due to all EXCEPT - 
Select and explain. 
A. Staphylococcus aureus, B. Clostridium botulinum, C. ETEC, D. B. cereus
C: ETEC
Answer: C: ETEC 
Explanation: None