This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Phelps sign is seen in \nSelect and explain. \nA. Glomus jugulare, B. Vestibular Schwannoma, C. Menniers disease, D. Neurofibromatosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Phelps sign is the loss of crust of bone between the carotid canal and jugular bulb in glomus jugulare as seen in CT scan. Ref: Dhingra 7th edition pg.122', 'role': 'assistant'}]