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 malignaney - \nSelect and explain. \nA. Osterosarcoma, B. Mesenchymal chondrosarcoma, C. Ewing's sarcoma, D. Leiomyosarcoma", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Ewing's sarcoma", 'role': 'assistant'}]