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
[{'content': 'C.E.A. (Carcinoembryonic antigen) is elevated in all except - \nSelect and explain. \nA. Alcoholic Cirrhosis, B. Ca-colon, C. Ulcerative Colitis, D. Emphysema', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]