This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acoustic Neuroma, Subject name: ENT
The earliest symptom of acoustic nerve tumour is: 
Select and explain. 
A. Sensorineural hearing loss, B. Facial weakness, C. Vertigo, D. Otorrhoea
A: Sensorineural hearing loss
Answer: A: Sensorineural hearing loss 
Explanation: (a) Sensorineural hearing loss(Ref. Scott Brown, 8th ed., Vol 2 page 1371)Mild vertigo and Facial weakness occur late.There is no ear discharge in Acoustic neuroma.