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
All are implicated in etiology of atrophic rhinitis except: 
Select and explain. 
A. Chronic sinusitis, B. Nasal deformity, C. DNS, D. Strong hereditary factors
C: DNS
Answer: C: DNS 
Explanation: Ans. is c i.e. DNS