This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pediatrics
The diagnosis of allergic rhinitis in children is established as they reach the age of 
Select and explain. 
A. 2years, B. 3years, C. 4years, D. 6years
D: 6years
Answer: D: 6years 
Explanation: Allergic rhinitis (AR) is an inflammatory disorder of the nasal mucosa marked by nasal congestion, rhinorrhea, and itching, often accompanied by sneezing and conjunctival inflammation. The symptoms may appear in infancy; with the diagnosis generally established by the time the child reaches age 6years. The prevalence peaks late in childhood.Reference: Nelson Textbook of Paediatrics; 20th edition; Chapter 143; Allergic Rhinitis