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
Best view to seen pneumoperitoneum is 
Select and explain. 
A. Chest X-ray in erect position, B. X-ray abdomen, C. USG abdomen, D. FAST
A: Chest X-ray in erect position
Answer: A: Chest X-ray in erect position 
Explanation: Best view to seen pneumoperitoneum - Chest x-ray in erect position.
If unable to stand - Left lateral decubitus View.