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: Surgery
Carcinoembryonic antigen is associated with 
Select and explain. 
A. Hepatocellular carcinoma, B. Medullary carcinoma of thyroid, C. Serninoma, D. Carcinoma of colon
D: Carcinoma of colon
Answer: D: Carcinoma of colon 
Explanation: None