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': 'Free gas in abdomen (under the diaphragm) can be best diagnosed by which X–ray – \nSelect and explain. \nA. Standing, B. Right lateral recumbent view, C. Left lateral recumbent view, D. Sitting position', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The best view to see pneumoperitoneum is Chest X-ray (not abdominal X-ray) in upright position which detects air under the domes of diaphragm.', 'role': 'assistant'}]