This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, Subject name: ENT
[{'content': 'Tonsil reach their maximum size by \nSelect and explain. \nA. 1 year, B. 3 years, C. 5 years, D. 12 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tonsils reach maximum size by 6-7 years and then involuteClosest among the options is 5 yearsRef: Hazarika; 3rd ed', 'role': 'assistant'}]