**Core Concept:** Glaucoma is a group of eye diseases characterized by elevated intraocular pressure (IOP) which damages the optic nerve, leading to visual impairment and potential blindness. The goal of treatment is to lower IOP to protect the optic nerve.

**Why the Correct Answer is Right:** Glaucoma is classified into two main types: Open-angle glaucoma and closed-angle glaucoma. Open-angle glaucoma is further divided into primary and secondary forms. In primary open-angle glaucoma (POAG), the drainage angle in the eye remains open, but the drainage canals do not function properly, leading to elevated IOP. The correct answer, C, refers to POAG where inflammation is minimal because the drainage angle remains open, unlike closed-angle glaucoma where inflammation is common due to the closure of the drainage angle.

**Why Each Wrong Option is Incorrect:**

A. Closed-angle glaucoma (ACG) is characterized by the closure of the drainage angle, leading to elevated IOP and significant inflammation as the iris tissue pushes the corneal-scleral wall and obstructs the drainage channels. This type of glaucoma does not match the given options.

B. Angle-closure glaucoma (ACG) is another type of glaucoma characterized by closure of the angle and elevated IOP, but it differs from closed-angle glaucoma in that the iris-corneal angle is narrowed, not completely closed. This is not the correct answer as we are looking for a type with minimal inflammation.

D. Traumatic glaucoma is a secondary cause of increased IOP, resulting from eye trauma, but it is not a type of glaucoma. This option is incorrect as it is not a primary cause of elevated IOP and inflammation.

**Clinical Pearl:**

Understanding the different types of glaucoma is crucial in managing patients with suspected glaucoma. Elevated IOP and inflammation are common in closed-angle glaucoma, while primary open-angle glaucoma is characterized by minimal inflammation due to the open angle.