Which of these conditions could potentially lead to conductive hearing loss?

Otosclerosis is a condition that can lead to conductive hearing loss due to abnormal bone growth in the middle ear, specifically affecting the stapes bone. This abnormal growth can cause the stapes to become fixed in place, preventing it from adequately transmitting sound vibrations from the middle ear to the inner ear. As a result, this mechanical blockage interferes with normal sound conduction, leading to hearing difficulties.

In contrast, the other conditions listed are not primarily associated with conductive hearing loss. Aging typically contributes to sensorineural hearing loss due to changes in the inner ear structures or auditory pathways. Noisy environments are often linked to sensorineural hearing loss resulting from damage to the hair cells in the cochlea. Genetic disorders may affect hearing in various ways, but when they contribute to hearing loss, it's more commonly sensorineural unless they specifically cause structural anomalies affecting the middle ear. Therefore, otosclerosis stands out as the primary condition among the choices that directly causes conductive hearing loss.