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
Tenesmus occurs in lesions of 
Select and explain. 
A. Ileum, B. Right side of colon, C. Descending colon, D. Sigmoid colon
D: Sigmoid colon
Answer: D: Sigmoid colon 
Explanation: None