This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
Most common cause of nasal polyp in children is? 
Select and explain. 
A. Human papilloma virus, B. Allergic rhinitis, C. Inveed papilloma, D. Rhinosporidiosis
B: Allergic rhinitis
Answer: B: Allergic rhinitis 
Explanation: Ans. is'b'i.e., Allergic rhinitisRe/ BRS Gross Anatomy p' 405)The most common cause of nasal polyp is allergic rhinitis'Nasal polyps are not paicularly common in children.Occasionally so-called "allergic PolyPs" are encountered' and occasionally recurrent bouts of allergy and infection lead to chronic hyperophic polypoid rhinosinusitis.However' most commonly when nasal polyps are encountered in children, the underlying problem is cystic fibrosis'