This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
[{'content': 'Sensitive most investigation to detect minimal intraperitoneal free air \nSelect and explain. \nA. Standing x-ray abdomen, B. Right lateral decubitus x-ray, C. Chest x-ray, D. Left lateral decubitus x-ray', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Although as little as 1 ml of free gas can be demonstrated radiographically, either in chest PA or a left lateral decubitus abdominal film, CT is superior to plain radiographs in detecting minute quantities of pneumoperitoneum. Chest PA view is more sensitive than even a left lateral decubitus abdominal film.', 'role': 'assistant'}]