This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Pathology
[{'content': 'CEA is a marker for all except - \nSelect and explain. \nA. Carcinoma pancreas, B. Carcinoma colon, C. Carcinoma lung, D. Carcinoma prostate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Tumor marker carcinomas CEA colon, pancreas, stomach, breast, liver, lung CA-125 ovary, cervix PSA prostate Thyroglobulin thyroid AFP non-seminomatous testicular tumors,liver, ovary, lung beta-HCG non seminomatous testicular tumors, breast, stomach Alkaline phospatase bone, liver, pancreas, prostate, leukemia CA 19-9 pancreas, stomach, colon TEXT BOOK OF ROBBINS BASIC PATHOLOGY NINTH EDITION PAGE.667', 'role': 'assistant'}]