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: Surgery
[{'content': 'Commonest cause of colonic obstruction in neonates is - \nSelect and explain. \nA. Meconium ileus, B. Aganglionic colon, C. Heal atresia, D. Volvulusd) Hernia', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Aganglionic colon i) Option 'a & c' are causes of small bowel obstruction not colonic obstruction ii) Most common cause of Intestinal obstruction in a neonate is Intestinal atresia - p. 1133, 1232 Nelson", 'role': 'assistant'}]