This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
X-ray abdomen diagram with multiple fluid levels: 
Select and explain. 
A. Intestinal obstruction, B. Hollow viscus perforation, C. Pyoperitoneum, D. None
A: Intestinal obstruction
Answer: A: Intestinal obstruction 
Explanation: Ans. (a) Intestinal obstructionRef: Bailey 26th edition, Page 1189* 3-5 air fluid levels is normal* >5 fluid levels suggest obstruction.