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': 'Ethmoidal polyp is ? \nSelect and explain. \nA. Due to infection, B. Single, C. Recurrent, D. Occurs in children', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Recurrent", 'role': 'assistant'}]