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
Ethmoidal polyp is ? 
Select and explain. 
A. Due to infection, B. Single, C. Recurrent, D. Occurs in children
C: Recurrent
Answer: C: Recurrent 
Explanation: Ans. is 'c' i.e., Recurrent