All of the following will produce conductive hearing loss except
Otosclerosis, serous otitis media, suppurative otitis media come under acquired causes of conductive hearing loss Endolymphatic hydrops which is Meniere's disease is associated with sensorineural deafness. Ref: Dhingra 7e pg 32,34.
Otosclerosis
Serous otitis media
Endolymphatic Hydrops
Suppurative otitis media
Ear