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
[{'content': 'Failure to pass meconium within 48 hrs of bih in a newborn with no obvious external abnormality should lead to the suspicion of- \nSelect and explain. \nA. Anal atresia, B. Congenital pouch colon, C. Congenital aganglinosis, D. Meconium ileus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., Congenital aganglinosis o Read what Nelson says about Hirschsprung\'s disease (Congenital aganglinosis). o "Ninety nine percent of full term infants pass meconium within 48hrs of bih. Hirschsprung disease should be suspected in any full term infant with delayed passage of stool".', 'role': 'assistant'}]