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
Most important prognostic factor for colorectal carcinoma is 
Select and explain. 
A. Site of lesion, B. Tumour size & characteristics, C. Age of patient, D. Lymph node status
D: Lymph node status
Answer: D: Lymph node status 
Explanation: "The number of positive nodes appeared to be the single most important prognostic factor."-DeVita