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': 'MIC-2 is a marker of? \nSelect and explain. \nA. Ewing sarcoma, B. Chronic lymphocytic leukemia, C. Mantle cell lymphoma, D. All of these', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Harshmohan textbook of pathology 7th edition ☆ In Ewings sarcoma - the cell surface marker by the tumor cells of ES / PNET group is CD99 which is a product of MIC2 gene located on X and Y chromosome.', 'role': 'assistant'}]