**Core Concept**
Sunflower cataract is a type of posterior subcapsular cataract characterized by a petaloid or sunflower-like appearance. It is often associated with posterior capsular rupture after intraocular lens implantation or other ocular trauma.

**Why the Correct Answer is Right**
The sunflower cataract is thought to result from the formation of posterior subcapsular opacities in the lens capsule, which can be caused by the release of inflammatory mediators or oxidative stress following a posterior capsular rupture. The petaloid or sunflower-like appearance of the cataract is due to the formation of radial opacities in the lens capsule. This type of cataract can lead to significant visual impairment if left untreated.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not directly relate to the formation of sunflower cataract. While age-related macular degeneration can cause posterior subcapsular opacities, it is not the primary cause of sunflower cataract.
**Option B:** This option is incorrect because it refers to a different type of cataract formation. Cortical cataracts are characterized by opacities in the lens cortex, not the posterior subcapsular region.
**Option C:** This option is incorrect because it does not accurately describe the sunflower cataract. While posterior capsular opacification can occur after intraocular lens implantation, it is not the same as a sunflower cataract.

**Clinical Pearl / High-Yield Fact**
Sunflower cataract is a classic example of a posterior subcapsular cataract, which can be a complication of posterior capsular rupture or intraocular lens implantation. It is essential to recognize the characteristic petaloid or sunflower-like appearance of this type of cataract to provide appropriate treatment.

**Correct Answer: C. Posterior capsular rupture or intraocular lens implantation.**