This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral Cavity, Subject name: ENT
[{'content': 'Penicillin should be given to a patient with group A beta haemolytic streptococci infection of the tonsils for a period of: \nSelect and explain. \nA. 3-5 days, B. 10-14 days, C. 21 days, D. 1 month', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: b', 'role': 'assistant'}]