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 predisposing factors for sigmoid volvulus except: 
Select and explain. 
A. Hirschsprung's diseases, B. Chagas diseases, C. Chronic constipation, D. Tuberculosis
D: Tuberculosis
Answer: D: Tuberculosis 
Explanation: Hirschsprung's disease and Chagas disease can lead to megacolon, a risk factor for sigmoid volvulus.