**Core Concept**
Rinne's test and Weber's test are clinical assessments used to differentiate between conductive and sensorineural hearing losses. Rinne's test compares the perception of a tuning fork on bone versus air conduction, while Weber's test compares the perception of a tuning fork on the midline versus one ear.

**Why the Correct Answer is Right**
The patient's negative Rinne's test in the right ear indicates that bone conduction is better than air conduction, which is characteristic of conductive hearing loss. Conductive hearing loss occurs when there is a problem with the middle ear, such as a perforated eardrum or a buildup of fluid. This type of loss affects the conduction of sound waves to the inner ear, rather than the inner ear itself. In this case, the patient's symptoms and test results are consistent with a conductive hearing loss in the right ear. The Weber's test result, where the tone is perceived as louder in the right ear, further supports this diagnosis, as conductive hearing loss typically causes sound to lateralize to the affected ear.

**Why Each Wrong Option is Incorrect**
**Option B:** Right sensorineural hearing loss would result in a positive Rinne's test, as air conduction would be better than bone conduction. Sensorineural hearing loss affects the inner ear or the auditory nerve.
**Option C:** Left sensorineural hearing loss would not explain the patient's symptoms or test results in the right ear. The Weber's test would likely lateralize to the left ear in this case.
**Option D:** Left conductive hearing loss would not explain the patient's symptoms or test results in the right ear. The Rinne's test would be negative in both ears if there was a conductive hearing loss.

**Clinical Pearl / High-Yield Fact**
When performing Rinne's test, it is essential to use a 512 Hz tuning fork and to ensure that the patient is in a quiet environment to minimize background noise. Additionally, the patient should be instructed to close their eyes and concentrate on the sound to prevent auditory masking.

**✓ Correct Answer: A. Right conductive hearing loss**