This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Pathology
[{'content': '<img alt="" src=" />MIC-2 is a marker of \nSelect and explain. \nA. Ewing\'s sarcoma, B. Osteosarcoma, C. Dermatofibrous protruberns, D. Alveolar cell sarcoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Study repos on the specific expression of the MIC2 gene, a pseudoautosomal gene located on the sho arms of the X and Y chromosomes, on Ewing&;s sarcoma (ES) and peripheral primitive neuroectodermal tumor (pPNET) cells. The gene product, a cell membrane protein, is recognized by the newly established monoclonal antibody (MoAb) HBA-71 and the previously described MoAb 12E7 and RFB-1. Fuhermore, the reaction pattern of the MIC2 antibodies, especially HBA-71, with normal tissues and a great number of benign and malignant tumors (70 different tumors, 199 tumor samples), as well as the correlation between the specific chromosomal aberrations.', 'role': 'assistant'}]