**Core Concept**
Rinne's test is a screening tool used to assess the integrity of the middle ear system, specifically the conduction pathway between the outer ear and the inner ear. It evaluates the ratio of air conduction (AC) to bone conduction (BC) in a patient's hearing.

**Why the Correct Answer is Right**
Rinne's test is considered positive when air conduction is better than bone conduction, indicating normal middle ear function. This is because the middle ear's ossicles (malleus, incus, and stapes) efficiently transmit sound waves from the eardrum to the inner ear, allowing for better AC than BC. In a normal ear, the AC threshold is lower than the BC threshold.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because a positive Rinne's test requires better AC than BC, which is not the case in this scenario.
* **Option B:** This option is incorrect because a negative Rinne's test is typically seen in cases of conductive hearing loss, where BC is better than AC.
* **Option C:** This option is incorrect because a positive Rinne's test is not indicative of sensorineural hearing loss, which is characterized by poor BC and AC thresholds.

**Clinical Pearl / High-Yield Fact**
A classic exam trap is to remember that a negative Rinne's test (BC > AC) is indicative of conductive hearing loss, while a positive test (AC > BC) suggests normal middle ear function.

**Correct Answer: B. Conductive hearing loss.**