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
[{'content': 'Carcinoembryonic antigens (CEA) is except \nSelect and explain. \nA. Lung cancer, B. Breast cancer, C. Colon cancer, D. Osteogenic sarcoma', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e. Osteogenic sarcoma", 'role': 'assistant'}]