This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'Most impoant prognostic factor for colorectal carcinoma is \nSelect and explain. \nA. Site of lesion, B. Tumour size & characteristics, C. Age of patient, D. Lymph node status', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .Secondaries are said to be precocious, wherein liver secondary is first identified, later the primary site is detected (carcinoid tumour/colorectal carcinoma). When primary and liver secondaries are identified at the same time it is called as synchronous secondaries (carcinoma stomach). ref:SRB&;S manual of surgery,ed 3,pg no 545', 'role': 'assistant'}]