This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal Radiology, Subject name: Radiology
[{'content': 'Soap bubble appearence on abdominal radiograph is associated with \nSelect and explain. \nA. Achalasia cardia, B. Meconium ileus, C. Duodenal atresia, D. CHPS', 'role': 'user'}, {'content': "Answer: B \nExplanation: Soap-bubble' effect of gas mixed with 'meconium', commonly seen with 'meconium ileus'.", 'role': 'assistant'}]