question: Q:A 3-week-old neonate in the neonatal intensive care unit (NICU) has bilious vomiting. He was born at 31 weeks gestation by cesarean section due to maternal preeclampsia. The birth weight was 1100 g (2.4 lb). Meconium was passed on the 2nd day after birth, and he had an adequate number of wet diapers. He is on continuous nasogastric formula feeds. The vital signs include: temperature 34.4°C (94.0°F), blood pressure 80/40 mm Hg, pulse 120/min, and respiratory rate 62/min. The pulse oximetry is 96% on room air. The examination reveals a lethargic neonate with abdominal distension. There is frank blood in his diaper. Laboratory studies show metabolic acidosis. Which of the following is the most likely finding in this patient?? 
  {'A': 'Diffuse microcolon on barium enema', 'B': 'No air in the rectum on abdominal X-ray', 'C': 'Air in the bowel wall on abdominal X-ray', 'D': 'Double bubble sign on abdominal X-ray', 'E': 'Epigastric olive-shaped mass on abdominal sonography'},