This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Pathology
[{'content': 'Marker of glomus tumor - \nSelect and explain. \nA. CD-57, B. Cytokeratin, C. S-100, D. CD-34', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Additional studies using immunohistochemical techniques revealed that malignant glomus tumors are characterized by the presence of MIB-1, p53, Bcl-2, and CD34. Up to 4% of the tumors are functional and produce clinically significant levels of catecholamines, norepinephrine, or dopamine with symptoms mimicking a pheochromocytoma. Pheochromocytoma, parathyroid adenoma, and thyroid carcinoma have been repoed in association with glomus jugulare tumors. Ref: Medscape', 'role': 'assistant'}]