This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pediatric Surgery, Subject name: Surgery
[{'content': 'A newborn baby presents with absent anal orifice and meconuria. What is the most appropriate management: \nSelect and explain. \nA. Transverse colostomy, B. Conservative management, C. Posterior saggital anorectoplasty, D. Perineal V-Y plasty', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The presence of meconium in urine reflects some form of communication between the urinary tract and rectum, and suggests a high type of anorectal malformation. Such patients require a diveing colostomy. The colostomy decompresses the bowel and provides protection during the healing of subsequent repair. Posterior Saggital Anorectoplasty (PSARP) is performed after 4-8 weeks. The presence of meconium in urine and a flat bottom are considered indications of a protective colostomy.', 'role': 'assistant'}]