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
Soap bubble appearence on abdominal radiograph is associated with 
Select and explain. 
A. Achalasia cardia, B. Meconium ileus, C. Duodenal atresia, D. CHPS
B: Meconium ileus
Answer: B: Meconium ileus 
Explanation: Soap-bubble' effect of gas mixed with 'meconium', commonly seen with 'meconium ileus'.