This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Radiology
A newborn presenting with intestinal obstruction showed on X-ray multiple air fluid levels are seen. The diagnosis is most likely to be? 
Select and explain. 
A. Pyloric obstruction, B. Duodenal atresia, C. Ileal atresia, D. Ladd's bands
C: Ileal atresia
Answer: C: Ileal atresia 
Explanation: Ans. CMultiple air-fluid levels indicate a more distal site of obstruction along the bowel-hence llieal atresia in the newborn. It is associated with cystic fibrosis. Plain radiograph shows multiple air fluid levels and dilated loops of proximal bowel. Barium enema shows microcolon. On antenatal USG it is often discovered prenatally as proximal dilated intestinal segment.