**Core Concept**
Opsomyoclonus, also known as dancing eyes-dancing feet syndrome, is a rare neurological disorder characterized by involuntary muscle contractions and spasms, often accompanied by eye movements. This condition is typically associated with an underlying infection, particularly cerebellar ataxia, or a neoplastic process.

**Why the Correct Answer is Right**
Opsomyoclonus is often a manifestation of paraneoplastic syndrome, which occurs due to an abnormal immune response to a neoplasm, in this case, neuroblastoma. The condition is thought to result from the production of autoantibodies against the cerebellar cells, leading to their dysfunction and the characteristic symptoms of opsoclonus-myoclonus. The exact mechanism is not fully understood, but it is believed to involve the disruption of Purkinje cell function, which plays a crucial role in motor coordination and balance.

**Why Each Wrong Option is Incorrect**
**Option A:** This option would be incorrect as opsoclonus-myoclonus is not typically associated with this condition.
**Option B:** This option would be incorrect as opsoclonus-myoclonus is not typically associated with this condition.
**Option D:** This option would be incorrect as opsoclonus-myoclonus is not typically associated with this condition.

**Clinical Pearl / High-Yield Fact**
Opsoclonus-myoclonus can be a presenting feature of neuroblastoma, a common pediatric malignancy, and is often associated with a favorable prognosis if treated promptly.

**Correct Answer: C. Neuroblastoma**