This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastro Intestinal System, Subject name: Pediatrics
[{'content': "X-ray abdomen of neonate shows: \nSelect and explain. \nA. Duodenal atresia, B. Jejunal atresia, C. Pneumatosis intestinalis, D. Hirschsprung's disease", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Pneumatosis intestinalis.* The finding of pneumatosis intestinalis (air in the bowel wall) confirms the clinical suspicion of NEC and is diagnostic; 50-75% of patients have pneumatosis when treatment is started.* NEC is the most common life-threatening emergency of the gastrointestinal tract in the new-born period.* The greatest risk factor for NEC is prematurity.* Pneumatosis Intestinalis is seen modified Bell staging class 2A* Pneumoperitoneum is seen in modified Bell staging class 3B* Portal venous gas is a sign of severe disease, and pneumoperitoneum indicates a perforation.* Hepatic ultrasonography may detect portal venous gas despite normal abdominal roentgenograms. Image source. style="text-decoration: underline; color: rgba(17, 85, 204, 1); font-family: Times New Roman, Times, serif">638.jpg?cb=1363698022', 'role': 'assistant'}]