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
Incubation period of 6-7 hours is for food poisoning except: 
Select and explain. 
A. Staphylococcus aureus, B. Bacillus cereus, C. E. coli, D. Clostridium
C: E. coli
Answer: C: E. coli 
Explanation: E. coli