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
All of the following genes are implicated in carcinogenesis of colon, except: 
Select and explain. 
A. APC, B. k-ras, C. Beta catenin, D. Mismatch repair
C: Beta catenin
Answer: C: Beta catenin 
Explanation: . Beta catenin