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
Acoustic neuroma causes 
Select and explain. 
A. Cochlear deafness, B. Retrocochlear deafness, C. Conductive deafness, D. Veigo
B: Retrocochlear deafness
Answer: B: Retrocochlear deafness 
Explanation: The tumour almost arises from the Schwann cells of the vestibular, but rarely from the cochlear division of VIIIth cranial nerve. Acoustic neuroma causes progressive unilateral sensorineural hearing loss by pressure on cochlear nerve fibres. Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 125