This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: ENT
[{'content': 'Phelps sign is seen in : \nSelect and explain. \nA. Glomus jugulare, B. Vestibular shwanoma, C. Menniers disease, D. Neurofibromatosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' ie Glomus jugulare " The absence of the normal crest of bone between the carotid canal and jugular fossa on lateral tomography is virtually diagnostic of a glomus jugulare tumor. This is k/a Phelps\' sign." - Scott-Brown, 5/e', 'role': 'assistant'}]