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 staphylococcal food poisoning is - \nSelect and explain. \nA. 4-6 hrs, B. 6-12 hrs, C. 12-18 hrs, D. 18-24 hrs', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 4-6 hrs", 'role': 'assistant'}]