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
[{'content': 'Incubation period of 6-7 hours is for food poisoning except: \nSelect and explain. \nA. Staphylococcus aureus, B. Bacillus cereus, C. E. coli, D. Clostridium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: E. coli', 'role': 'assistant'}]