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: Surgery
Gasless abdomen in X-ray is a sign of - 
Select and explain. 
A. Acute pancreatitis, B. Necoising enterocolitis, C. Ulcerative colitis, D. Intussusception
A: Acute pancreatitis
Answer: A: Acute pancreatitis 
Explanation: Ans. is 'a' i.e., Acute pancreatitis Due to excessive vomiting