This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
All are true about electrocochleography except 
Select and explain. 
A. the electrode must be kept close to source of amplitude, B. actionpotentional is produced by inner hair cells and positive waves, C. cochlearmicrophonic is produced from the outer hair cells of the cochlea, D. mostly used in monitoring the meniers disease
B: actionpotentional is produced by inner hair cells and positive waves
Answer: B: actionpotentional is produced by inner hair cells and positive waves 
Explanation: Electrodes can be kept over the promontory,EAC or outside,the signals are better as much it is kept close to source. Different waves are cochlear microphonic:produced from outer hair cells action potential is produced by all the nerve fibers Used in diagnosis and monitoring the meiners disease and endolymphatic hydrops