**Core Concept**
Pars planitis is a form of intermediate uveitis, characterized by inflammation of the pars plana, a region of the ciliary body in the eye. This condition is often associated with systemic diseases and can lead to complications such as cataract formation and retinal detachment.

**Why the Correct Answer is Right**
The correct answer is related to the anatomical location of the inflammation in pars planitis. The pars plana is a part of the ciliary body, which is responsible for producing aqueous humor and maintaining the intraocular pressure. Inflammation in this region can lead to scarring and adhesion formation, which can compromise the function of the ciliary body.

**Why Each Wrong Option is Incorrect**
**Option A:** **Iridocyclitis** - Iridocyclitis is a form of anterior uveitis, which affects the iris and ciliary body, but it is not synonymous with pars planitis.
**Option B:** **Retinitis** - Retinitis refers to inflammation of the retina, which is a distinct condition from pars planitis.
**Option C:** **Chorioretinitis** - Chorioretinitis is a form of posterior uveitis, which affects the choroid and retina, but it is not equivalent to pars planitis.

**Clinical Pearl / High-Yield Fact**
Pars planitis is often associated with systemic diseases such as multiple sclerosis, sarcoidosis, and ankylosing spondylitis, making a thorough systemic evaluation essential in the diagnosis and management of this condition.

**Correct Answer: C. Chorioretinitis**