This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intestinal obstruction, Subject name: Surgery
Commonest cause of colonic obstruction in neonates is: 
Select and explain. 
A. Meconium ileus, B. Aganglionic colon, C. Ileal atresia, D. Volvulus
B: Aganglionic colon
Answer: B: Aganglionic colon 
Explanation: Aganglionic colon is Commonest cause of colonic obstruction in neonates.