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
25 year old patient Suspected to have a pneumoperitoneum. Patient is unable to stand. Best x-ray view is 
Select and explain. 
A. Left lateral decubitus view, B. Right lateral decubitus view, C. Supine, D. Prone
A: Left lateral decubitus view
Answer: A: Left lateral decubitus view 
Explanation: Left lateral decubitus view demonstrates the air between dense shadow of liver and the abdominal wall.