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
Microdeletion leading to instability of DNA, causing the cell to undergo degeneration is seen as a marker in which of the following cancer? 
Select and explain. 
A. Medullary carcinoma of thyroid, B. Small cell lung cancer, C. Gastric lymphoma, D. Colon carcinoma
D: Colon carcinoma
Answer: D: Colon carcinoma 
Explanation: Microsatellite instability is due to impaired DNA missmatch repair. It is associated with many malignancies but colon cancer has highest association.