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
Absence of myenteric ganglion is seen in - 
Select and explain. 
A. Crohn's disease, B. Ulcerative colitis, C. Hirschprung's disease, D. Intussusception
C: Hirschprung's disease
Answer: C: Hirschprung's disease 
Explanation: None