This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
The specific micro-organism suspected to cause food poisoning on the basis of sho incubation period are all of the following except: 
Select and explain. 
A. Staphylococcus aureus, B. B. cereus, C. E.coli, D. C. perfringens
C: E.coli
Answer: C: E.coli 
Explanation: Esch.coli causes food poisoning having long incubation period. All other options have a shoer incubation period. Food Poisoning Organism Incubation period Staphylococcus 1-6 hours Salmonella 12-24 hours Botulism 12-36 hours Clostridium perfringens 6-24 hours Bacillus cereus 1-6 hours E.coli 8-72 hours