This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': '13.All the following are true of antrochonal polyp,except: \nSelect and explain. \nA. Common in children, B. Single and unilateral, C. Bleeds on touch, D. Treatment involves avulsion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref.Dhingra 6/e p 174,175', 'role': 'assistant'}]