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': 'Best investigation for air in peritoneal cavity is ? \nSelect and explain. \nA. USG, B. Laparotomy, C. Laparoscopy, D. X-ray abdomen-erect view', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., X-ray abdomen-erect view", 'role': 'assistant'}]