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
Gasless abdomen is a feature of: 
Select and explain. 
A. High obstruction, B. Acute pancreatitis, C. Congenital diaphragmatic hernia, D. All
D: All
Answer: D: All 
Explanation: D i.e. All