**Core Concept**
The Reese-Ellsworth classification is a system used to predict the visual prognosis in patients with intraocular retinoblastoma, a type of cancer that primarily affects children. This classification helps ophthalmologists and oncologists determine the potential visual outcome of the disease and make informed decisions about treatment.

**Why the Correct Answer is Right**
The Reese-Ellsworth classification is specifically designed for retinoblastoma, taking into account the size and number of tumors, as well as their location within the eye. The classification system assigns a score to each eye, with higher scores indicating a poorer visual prognosis. This system helps clinicians predict the likelihood of achieving a good visual outcome and guide treatment decisions accordingly. The classification is based on the extent of tumor involvement in the eye, with larger tumors and those closer to the optic nerve having a worse prognosis.

**Why Each Wrong Option is Incorrect**
**Option A:** Rhabdomyosarcoma is a different type of cancer that affects muscle tissue and is not associated with the Reese-Ellsworth classification.
**Option C:** Optic nerve sheath tumors are a type of tumor that affects the optic nerve, but they are not classified using the Reese-Ellsworth system.
**Option D:** Meningioma is a type of tumor that affects the meninges, the protective membranes surrounding the brain and spinal cord, and is not related to the Reese-Ellsworth classification.

**Clinical Pearl / High-Yield Fact**
The Reese-Ellsworth classification is an essential tool for clinicians managing retinoblastoma, as it helps predict visual outcomes and guide treatment decisions. A high score on the classification indicates a poorer visual prognosis, and clinicians should consider alternative treatment options, such as enucleation (removal of the eye) or more aggressive chemotherapy, in these cases.

✓ Correct Answer: B. Retinoblastoma