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 salmonella typhi - \nSelect and explain. \nA. 2-5 days, B. 3-21 days, C. 14-25 days, D. 0-60 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ‘The incubation period for S. Typhi averages 10–14 days but ranges from 3 to 21 days, with the duration likely reflecting the\xa0inoculum size and the host’s health and immune status.’', 'role': 'assistant'}]