<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 4-week-old neonate boy who was born at 27 weeks gestation to a 19-year-old G2P1 mother due to premature rupture of membranes has his hospital stay complicated by chorioamnionitis. He received 2 doses of surfactant and has been weaned from the ventilator to continuous positive airway pressure CPAP. Over the last 6 hours he has developed abdominal distention and is no longer tolerating his tube feeds. You suspect necrotizing enterocolitis. Which of the following would be diagnostic?? A: Pyloric thickness greater than 3 mm on abdominal ultrasound, B: Positive blood culture for coagulase-negative Staphylococcus aureus, C: A double-bubble sign on an abdominal X-ray, D: Pneumatosis intestinalis on an abdominal X-ray, E: Suction biopsy showing absence of ganglion cells,  <response>: This is a question about diagnosing necrotizing enterocolitis NEC in a premature infant. Based on the clinical history provided, NEC is suspected given the abdominal distention and feeding intolerance. To confirm the diagnosis, we need to look for findings specific for NEC. Choice A describes pyloric stenosis, which is unrelated. Choice B may indicate sepsis but does not confirm NEC. Choice C describes a double bubble sign seen in duodenal atresia, again unrelated. Choice D describes pneumatosis intestinalis, which is gas in the intestinal wall and is a classic radiographic finding in NEC. Choice E describes testing for Hirschsprung disease, which is unrelated. Therefore, choice D describing pneumatosis intestinalis on abdominal X-ray is the diagnostic finding for NEC.D: Pneumatosis intestinalis on an abdominal X-ray 