**Core Concept**
The patient's symptoms and test results suggest a diagnosis of otosclerosis, a type of conductive hearing loss characterized by abnormal bone growth in the middle ear. This condition affects the stapes bone, leading to impaired sound conduction.

**Why the Correct Answer is Right**
The patient's audiogram shows conductive deafness, and impedance audiometry reveals normal tympanic membrane mobility, but the absence of acoustic reflexes indicates a problem with the stapes bone. Otosclerosis is a common cause of conductive hearing loss in young adults, and treatment typically involves medical or surgical management to address the abnormal bone growth.

**Why Each Wrong Option is Incorrect**
* **Option A:** Sodium fluoride supplements are sometimes used to slow the progression of otosclerosis, but they are not a primary treatment for conductive hearing loss.
* **Option B:** Corticosteroids may be used to manage acute otitis media or other inflammatory conditions, but they are not a standard treatment for otosclerosis.
* **Option D:** Hearing aids are a common treatment for conductive hearing loss, including otosclerosis, as they can help amplify sound and improve communication.

**Clinical Pearl / High-Yield Fact**
In cases of otosclerosis, the stapes bone is often fixed in place, causing sound conduction to be impaired. This condition can be managed with medical treatment, such as sodium fluoride supplements, or surgical intervention, such as stapedotomy or stapedectomy.

**Correct Answer: A. Sodium fluoride supplements are sometimes used to slow the progression of otosclerosis, but they are not a primary treatment for conductive hearing loss.**