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