**Core Concept**
Optic disc edema and circumpapillary telangiectasia in a young individual, accompanied by visual field defects and normal pupillary response, suggest a diagnosis of optic disc neovascularization, likely secondary to optic disc drusen or optic disc pit. This condition is characterized by abnormal vascularization and leakage at the optic disc, leading to edema and visual field defects.

**Why the Correct Answer is Right**
The correct answer is likely **Optic Disc Drusen**. Optic disc drusen are small, yellowish deposits of tissue on the optic disc that can cause optic disc neovascularization and subsequent edema. The presence of circumpapillary telangiectasia and centrocecal scotoma on perimetry supports this diagnosis. The normal pupillary response suggests that the afferent pathway is intact, but the efferent pathway may be affected, leading to the visual field defects.

**Why Each Wrong Option is Incorrect**
* **Option A:** Papilledema is typically seen in conditions with increased intracranial pressure, such as idiopathic intracranial hypertension or mass lesions. The normal pupillary response and visual field defects make this diagnosis less likely.
* **Option B:** Optic neuritis typically presents with pain on eye movement, optic disc edema, and afferent pupillary defect. The normal pupillary response and lack of pain on eye movement make this diagnosis less likely.
* **Option C:** Optic disc pit is a congenital anomaly that can cause optic disc neovascularization and edema, but it is typically seen in children and young adults. The presence of centrocecal scotoma on perimetry makes this diagnosis less likely.

**Clinical Pearl / High-Yield Fact**
Optic disc drusen can be associated with other systemic conditions, such as multiple sclerosis, neurofibromatosis, and retinitis pigmentosa. A thorough ophthalmologic examination and imaging studies, such as optical coherence tomography (OCT) and fluorescein angiography, are essential for diagnosing and managing optic disc drusen.

**Correct Answer:** D. Optic Disc Drusen