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
[{'content': 'Most important cause of abdominal distension in intestinal obstruction – \nSelect and explain. \nA. Cases produced by bacterial activity, B. Cases diffused from blood, C. Swallowed air, D. Products of digestion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In intestinal obstruction distension of the intestine is caused by accumulation of gas and fluid proximal to and within the obstructed segmented.\n70-80% of this intestinal gas consists of swallowed air.', 'role': 'assistant'}]