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 of the following are true about antrochonal polyp,except - 
Select and explain. 
A. Single, B. Unilateral, C. Premalignant, D. Arises from medullary antrum
C: Premalignant
Answer: C: Premalignant 
Explanation: Antrochoanal polyp is non-cancerous growth arising from the mucous membrane of the maxillary sinus and reaches the opening of the sinus in the nasal cavity.
It is single and unilateral, i.e. it occurs in one of the maxillary sinus.