**Core Concept**
Giant papillary conjunctivitis (GPC) is an inflammatory condition affecting the conjunctiva, characterized by the development of large papillae on the upper tarsal conjunctiva. It is often associated with ocular irritation, discomfort, and blurred vision. GPC is typically linked to the use of contact lenses, but other factors can also contribute to its development.

**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of GPC, which involves chronic irritation of the conjunctiva. In the context of contact lens wear, the correct answer is likely related to the friction and mechanical stress caused by the lens on the conjunctival surface. This irritation triggers an immune response, leading to the release of cytokines and the development of large papillae.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not a known cause of GPC. While some systemic conditions can cause conjunctival inflammation, they are not typically associated with the development of giant papillae.
* **Option B:** This option may be a contributing factor to conjunctival irritation, but it is not a primary cause of GPC. Allergic reactions can cause conjunctival inflammation, but they are not typically characterized by giant papillae.
* **Option C:** This option is not a known cause of GPC. While some ocular conditions can cause conjunctival inflammation, they are not typically associated with the development of giant papillae.

**Clinical Pearl / High-Yield Fact**
GPC can be a challenging condition to diagnose, as the symptoms can be nonspecific and may resemble other ocular conditions. However, a key clinical clue is the presence of large papillae on the upper tarsal conjunctiva, which can be visualized using a slit lamp.

**Correct Answer: C. Contact lenses. Contact lens-induced giant papillary conjunctivitis is a common complication of prolonged contact lens wear.**