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
The commonest cause of colonic obstruction in neonates is - 
Select and explain. 
A. Meconium ileus, B. Aganglionic colon, C. Beal atresia, D. Volvulus
B: Aganglionic colon
Answer: B: Aganglionic colon 
Explanation: Option 'a & c' are causes of small bowel obstruction, not colonic obstruction
A most common cause of Intestinal obstruction in a neonate is Intestinal atresia — p. 1133, 1232 Nelson