This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'All of the following genes are implicated in colon carcinoma by classical pathway except \nSelect and explain. \nA. APC, B. K-ras, C. Beta-catenin, D. Mismatch repair genes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]