## Core Concept
The "enlarging dot sign" in fundus fluorescein angiography is a characteristic feature observed in certain retinal conditions. This sign is particularly associated with the progression of lesions in the retina. Fundus fluorescein angiography is a diagnostic tool used to visualize the retinal and choroidal vasculature.

## Why the Correct Answer is Right
The enlarging dot sign is specifically indicative of **retinal neovascularization**, particularly in diseases like diabetic retinopathy. In the context of diabetic retinopathy, the enlarging dot sign represents the growth of new, fragile vessels that can leak fluorescein dye, making them visible during fluorescein angiography. This sign is a marker of active neovascularization and potential for complications like vitreous hemorrhage.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not accurately represent the condition associated with the enlarging dot sign.
- **Option B:** Similarly, this option does not correctly correspond to the clinical finding of the enlarging dot sign in fundus fluorescein scanning.
- **Option D:** This option is also incorrect as it does not relate to the specific condition characterized by the enlarging dot sign.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that the enlarging dot sign is highly suggestive of **neovascularization** in the retina, which is a critical factor in the progression and management of diabetic retinopathy. Early detection of such signs can guide laser photocoagulation therapy to prevent complications.

## Correct Answer Line
**Correct Answer: C.**