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
[{'content': 'All are implicated in etiology of atrophic rhinitis except: \nSelect and explain. \nA. Chronic sinusitis, B. Nasal deformity, C. DNS, D. Strong hereditary factors', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c i.e. DNS', 'role': 'assistant'}]