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: Pathology
[{'content': 'What is meant by Ca colon stage Mc ? \nSelect and explain. \nA. Hepatic metastasis., B. Extension upto serosa & lymph node, C. Extension upto serosa, D. Extension upto mucosa', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., Extension upto Serosa and lymph nodesStaging of colon carcinomaDukes Numerical Pathological descriptionA I Ca limited to mucosa & submucosa13, I Ca extends to submuscularisB2 II Ca extends to serosaC III Ca involves regional lymph nodesD IV Distant metastasis in liver, lung etc.Following information has been added in 8th/e of Robbins o Liver is the most common site for metastasis of colon carcinoma.", 'role': 'assistant'}]