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: Pediatrics
A 3 days old baby is admitted with intraventricular hemorrhage. Baby develops abdominal distention. The X-ray abdomen showed pneumatosis poalis. Stage the necrotizing enterocolitis: 
Select and explain. 
A. lb, B. 2a, C. 2b, D. 3a
C: 2b
Answer: C: 2b 
Explanation: Answer- C. 2bThe severity, radiology and management of Necrotizing enterocolitis is best exemplified by the 'Modified Bell's stagingcrileria'- According to 'Modified Bell's staging criteria'pneumatosis poalis (Presinie of gas in pofiai vein) is suggestiveof stage 2b.