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: Pediatrics
Most important cause of abdominal distension in intestinal obstruction – 
Select and explain. 
A. Cases produced by bacterial activity, B. Cases diffused from blood, C. Swallowed air, D. Products of digestion
C: Swallowed air
Answer: C: Swallowed air 
Explanation: In intestinal obstruction distension of the intestine is caused by accumulation of gas and fluid proximal to and within the obstructed segmented.
70-80% of this intestinal gas consists of swallowed air.