system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Tonsil reach their maximum size by
assistant
The correct answer is  Tonsils reach maximum size by 6-7 years and then involuteClosest among the options is 5 yearsRef: Hazarika; 3rd ed