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: Radiology
[{'content': 'Best view to seen pneumoperitoneum is \nSelect and explain. \nA. Chest X-ray in erect position, B. X-ray abdomen, C. USG abdomen, D. FAST', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Best view to seen pneumoperitoneum - Chest x-ray in erect position.\nIf unable to stand - Left lateral decubitus View.', 'role': 'assistant'}]