**Core Concept**
Paraneoplastic cerebellar ataxia (PCA) is a rare, immune-mediated disorder that occurs in association with certain types of cancer, including Hodgkin's lymphoma. This condition is characterized by progressive ataxia, often accompanied by other neurological symptoms, due to autoimmune damage to the cerebellum.

**Why the Correct Answer is Right**
The production of autoantibodies against the Purkinje cells of the cerebellum is a key feature of PCA. In Hodgkin's lymphoma, PCA is often associated with the presence of anti-Yo antibodies, which are targeted against the cytoplasmic proteins of Purkinje cells. These autoantibodies trigger an immune response that leads to the destruction of Purkinje cells, resulting in ataxia and other neurological symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** Anti-Ri antibodies are associated with opsoclonus-myoclonus syndrome, a different paraneoplastic neurological disorder.
**Option B:** Anti-Hu antibodies are associated with small cell lung cancer and are typically linked to encephalomyelitis or sensory neuropathy.
**Option C:** Anti-Ma2 antibodies are associated with paraneoplastic limbic encephalitis, often in the context of testicular cancer.

**Clinical Pearl / High-Yield Fact**
Paraneoplastic cerebellar ataxia is a rare but important consideration in patients with Hodgkin's lymphoma, particularly those with progressive ataxia and other neurological symptoms. Early recognition and diagnosis are crucial to avoid misdiagnosis and delayed treatment.

**Correct Answer:** A. Anti-Yo antibodies.