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
Brown's sign is seen In 
Select and explain. 
A. Glomus tumour, B. Meniere's disease, C. Acoustic neuroma, D. Otosclerosis
A: Glomus tumour
Answer: A: Glomus tumour 
Explanation: Brown's sign, also called pulsation sign, is seen in glomus tumour. When pressure is raised in the ear canal with a Siegel's speculum, tumour first pulsates vigorously and then blanches; reverse occurs when pressure is released.