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: Pathology
The Commonest site of "Diveiculosis" is: 
Select and explain. 
A. Ascending colon, B. Transverse colon, C. Descendin colon, D. Sigmoid colon
D: Sigmoid colon
Answer: D: Sigmoid colon 
Explanation: Sigmoid colon