This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'A 6-year-old girl complains of otalgia, fever, and irritability. Physical examination reveals a stiff, bulging, red tympanic membrane. Previous history of ear infections is denied. Clinical response to amoxicillin is maximized on which of the following durations? \nSelect and explain. \nA. 1 day, B. 5 days, C. 7 days, D. 10 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Prospective nonrandomized evaluations of treatment duration of acute otitis media reveal no difference in outcome if given over 5-day, 7-day, or 10-day duration. However, 10-day treatment is indicated for children with history of acute otitis media within the preceding month.', 'role': 'assistant'}]