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. (Carcinoma embryonic 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: Ans. is 'd' i.e., Emphysema", 'role': 'assistant'}]