Which is hardening of the bony tissue of the middle ear?

• A. Otosclerosis
• B. Nystagmus
• C. Acoustic neuroma
• D. Ear lavage water temperature

Answer: (A)

Hardening of the bony tissue in the middle ear is otosclerosis. In this condition, abnormal bone growth occurs around the stapes (the smallest bone in the middle ear), causing the stapes to become fixed and unable to vibrate normally. Since sound travels from the eardrum through the ossicles to the inner ear, a fixed stapes disrupts this transmission, leading to conductive hearing loss. It often starts gradually and can be hereditary. The other options aren’t about hardening bone in the middle ear: nystagmus is an eye movement disorder; acoustic neuroma is a tumor affecting the vestibulocochlear nerve and typically causes sensorineural hearing loss and balance issues; ear lavage water temperature is a procedural detail, not a disease.