Final answer:
Conduction hearing loss can be caused by impacted cerumen and ototoxic medications, but not by fluid in the middle ear.
Step-by-step explanation:
Conduction hearing loss can be caused by all of the following except:
- Impacted cerumen
- Ototoxic medications
- Fluid in the middle ear
- Chronic ear infections
Conduction hearing loss occurs when there is a problem conducting sound waves from the outer ear to the middle ear. It can be caused by factors such as blockage of the ear canal (impacted cerumen), certain medications that are toxic to the ear (ototoxic medications), and chronic ear infections. However, fluid in the middle ear is associated withsensorineural hearing loss rather than conduction hearing loss.