This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'CD 34 is a tumor marker used for- \nSelect and explain. \nA. Ewings sarcoma, B. Myofibrosarcoma, C. Alveolar soft pa sarcoma, D. Inflammatory myofibroblastic tumor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Harshmohan textbook of pathology 7th edition. CD 34 is an immunohistochemical stain for sarcoma i;e, endothelial marker. S100 is the immunohistochemical stain for Ewings sarcoma..', 'role': 'assistant'}]