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: Surgery
[{'content': "Aaron's sign is seen in \nSelect and explain. \nA. Achlasia cardia, B. Hiatus hernia, C. Mediastinum emphysema, D. Acute appendicitis", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Acute appendicitis", 'role': 'assistant'}]