This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'Which one of the following is not used as a tumor marker in testicular tumors? \nSelect and explain. \nA. AFP, B. LDH, C. HCG, D. CEA', 'role': 'user'}, {'content': "Answer: D \nExplanation: CEA is an oncofetal antigen and may be used as a tumor marker in adenocarcinoma of colon, pancreas, lung, breast, and ovary. However not used as a marker for germ cell tumorsTumor markers for germ cell tumors:Alpha-fetoprotein seen in non-seminomatous germ cell tumorsHCG: 1. non-seminomatous germ cell tumors; 2. Non-seminomatous germ cell tumorsOthers:LDHPlacental alkaline phosphatase(Ref: Harrison's 18/e p652, table 81-6)", 'role': 'assistant'}]