**Core Concept**
Secondary vitreous is a type of embryonic vitreous that forms in the second trimester of pregnancy, replacing the primary vitreous. It is composed of a network of collagen fibers and cells, which eventually give rise to the adult vitreous body.

**Why the Correct Answer is Right**
The development of secondary vitreous is a complex process involving the transformation of primary vitreous into a more organized and fibrous structure. This process is mediated by the migration of glial cells from the optic nerve head to the vitreous body. As the secondary vitreous grows, it gradually replaces the primary vitreous, eventually forming the adult vitreous body that fills the eye.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as primary vitreous is the first type of vitreous that forms, but it is not the origin of secondary vitreous.
**Option B:** This option is incorrect as the hyaloid artery is a structure that supplies the primary vitreous, but it is not directly involved in the formation of secondary vitreous.
**Option C:** This option is incorrect as the retina is a neural tissue that is not directly involved in the formation of secondary vitreous.

**Clinical Pearl / High-Yield Fact**
Recall that the development of secondary vitreous is a critical process that occurs in the second trimester of pregnancy, and any disruption to this process can lead to congenital anomalies of the eye.

**Correct Answer: D. The primary vitreous.**