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': "Clear cells are seen in \nSelect and explain. \nA. Chondrosarcoma, B. Osteosarcoma, C. Fibrosarcoma, D. Ewing's sarcoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Clear cells are seen in \n\nChondrosarcoma\nClear cell carcinoma\nClear cell acanthoma', 'role': 'assistant'}]