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': "Large Intracytoplasmic glycogen storage is seen in which of the following malignancy - \nSelect and explain. \nA. Osteosarcoma, B. Mesenchymal chondrosarcoma, C. Ewing's sarcoma, D. Leiomyosarcoma", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]