This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nasal Polyposis, Subject name: ENT
All of the following are true about antrochoanal polyp except: 
Select and explain. 
A. Single, B. Unilateral, C. Premalignant, D. Arises from maxillary antrum
C: Premalignant
Answer: C: Premalignant 
Explanation: (c) Premalignant(Ref. Scott Brown, 6th ed., 4/10/14)Nasal polyps arise due to edema of the nasal mucosa. They are not premalignant.