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: Surgery
[{'content': 'A new born child has not passed meconium for 48 hrs. What is the diagnostic procedure of choice ? \nSelect and explain. \nA. USG, B. Contrast enema, C. CT, D. MRI', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A plain radiograph commonly shows signs of small bowel obstruction and a soft-tissue opacity. Diagnosis can be confirmed by an abdominal ultrasound scan or contrast enema. Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-80', 'role': 'assistant'}]