This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
Most common site for colorectal cancer is 
Select and explain. 
A. Rectum, B. Anal canal, C. Spleenic flexure, D. Appendix
A: Rectum
Answer: A: Rectum 
Explanation: Ans is 'a' i.e., Rectum * Following image demonstrates the distribution of colorectal adenocarcinoma:* Thus the most common site is Rectum. (rectum> sigmoid colon> caecum).