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: Orthopaedics
[{'content': "Large intracytoplasmic glycogen storage is found in \nSelect and explain. \nA. Fibrous dysplasia, B. Adamantinoma, C. Ewing's sarcoma, D. Osteoclastoma", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]