This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
[{'content': 'The most common cause of epistaxis in children? \nSelect and explain. \nA. Common cold, B. Nasal allergy, C. Polyp, D. Habitual nose picking', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The overall most common cause of epistaxis is idiopathic. In children, the most common cause is traumatic after nose picking. upper respiratory tract Infections lead to dryness, crusting and irritation which on removal by nose picking lead to epistaxis. (Ref: Cummings, 6th edition, pg no. 680 )', 'role': 'assistant'}]