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: Radiology
[{'content': "A newborn presenting with intestinal obstruction and constipation showed, on abdominal X ray, multiple air fluid levels. The diagnosis is not likely to be: \nSelect and explain. \nA. Pyloric obstruction, B. Duodenal atresia, C. Ileal atresia, D. Ladd's bands", 'role': 'user'}, {'content': "Answer: A \nExplanation: In Pyloric obstruction there will be only single air fluid level. For multiple air fluid levels on X ray obstruction should be distal to duodenal bulb. Ref: Walker's Pediatric Gastrointestinal Disease: Physiology, Diagnosis and Management By Ronald E. Kleinman, 2008, Page 122", 'role': 'assistant'}]