A 31 yrs old female patient complaints of bilateral impairment of hearing for the past 5 yrs.On examination,tympanic membrane is normal and audiogram shows a bilateral conductive deafness.Impedance audiometry shows as type of curve and acoustic reflexes are absent.All constitute part of the treatment,except:

• A. Sodium fluoride
• B. Gentamicin
• C. Hearing aid
• D. Stapedectomy