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
CD 34 is a tumor marker used for- 
Select and explain. 
A. Ewings sarcoma, B. Myofibrosarcoma, C. Alveolar soft pa sarcoma, D. Inflammatory myofibroblastic tumor
C: Alveolar soft pa sarcoma
Answer: C: Alveolar soft pa sarcoma 
Explanation: 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..