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': 'All of the following genes are implicated in carcinogenesis of colon, except: \nSelect and explain. \nA. APC, B. k-ras, C. Beta catenin, D. Mismatch repair', 'role': 'user'}, {'content': 'Answer: C \nExplanation: . Beta catenin', 'role': 'assistant'}]