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
All are common causes of ileal obstruction except? 
Select and explain. 
A. Adhesions, B. Obstructed hernia, C. Stricture, D. Hirschsprung's disease
D: Hirschsprung's disease
Answer: D: Hirschsprung's disease 
Explanation: Ans. (d) Hirschsprung's DiseaseRef.:Manipal Manual of surgery, 4th ed./731Common causes of ileal obstructionCommon causes of colonic obstruction* Adhesions* Obstructed hernia* Stricture* Intussusception* lleocaecalTB* Bands* Fecal impaction* Carcinoma colon* Hirschsprung's disease* Anorectal malformations