This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'Most common site of colorectal malignancy? \nSelect and explain. \nA. Caecum, B. Splenic flexure, C. Sigmoid colon, D. Rectum', 'role': 'user'}, {'content': "Answer: D \nExplanation: Rectum(38%) is the most common site of colorectal carcinoma followed by sigmoid colon(21%) and by caecum(12%).Transverse colon -5.5%; Ascending colon- 5%; Descending colon- 4%; Splenic flexure -3%; Hepatic flexure -2%; Appendix- 0.5%. Reference : page 1179 Bailey and Love's sho practice of surgery 25th edition", 'role': 'assistant'}]