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': 'In a 5 year old child, most common cause of unilateral epistaxis is - \nSelect and explain. \nA. Foreign body, B. Polyp, C. Atrophic rhinitis, D. Maggots', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common cause of unilateral epistaxis in children is Foreign body.\nIn case of Foreign Body of Nose “The child presents with unilateral nasal discharge which is often foul smelling and occasionally blood-stained.”', 'role': 'assistant'}]