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
[{'content': 'The specific micro-organism suspected to cause food poisoning on the basis of sho incubation period are all of the following except: \nSelect and explain. \nA. Staphylococcus aureus, B. B. cereus, C. E.coli, D. C. perfringens', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]