**Core Concept**
The cerebellum is responsible for coordinating movements, maintaining posture, and regulating balance. Signs of cerebellar disease are often related to impaired motor function, ataxia, and coordination.

**Why the Correct Answer is Right**
Cerebellar disease typically presents with signs of ataxia, dysmetria, and nystagmus. Ataxia is characterized by a lack of coordination and balance, leading to stumbling and difficulties with fine motor tasks. Dysmetria is an inability to judge distances and spatial relationships, resulting in overshooting or undershooting movements. Nystagmus, or involuntary eye movements, can also occur due to impaired cerebellar function.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely incorrect because it is a sign of cerebellar disease. Ataxia is a hallmark symptom of cerebellar dysfunction.

**Option B:** This option is also incorrect because it is a sign of cerebellar disease. Dysmetria is a common feature of cerebellar disorders.

**Option C:** This option is incorrect because it is a sign of cerebellar disease. Nystagmus can occur in patients with cerebellar lesions.

**Clinical Pearl / High-Yield Fact**
One key feature of cerebellar disease is the presence of intention tremors, which occur when attempting to perform fine motor tasks such as buttoning a shirt or writing. This is a classic sign of cerebellar dysfunction that can be remembered by the mnemonic "CEREBELLUM" - Coordination, Equilibrium, Reflexes, Eye movements, Balance, Limb ataxia, and Muscle tone.

**Correct Answer: D.**