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
Dukes classification is used for ? 
Select and explain. 
A. Pancreas carcinoma, B. Gastric carcinoma, C. Urinary bladder carcinoma, D. Colo-rectal carcinoma
D: Colo-rectal carcinoma
Answer: D: Colo-rectal carcinoma 
Explanation: Ans. is 'd' i.e., Colo-rectal carcinoma