**Core Concept**
Primary angle closure glaucoma (PACG) is a condition where the iris blocks the drainage angle of the eye, leading to increased intraocular pressure (IOP) and optic nerve damage. This condition requires immediate treatment to prevent vision loss.

**Why the Correct Answer is Right**
The correct treatment for PACG involves reducing IOP to prevent further damage to the optic nerve. This is typically achieved through medication, laser treatment, or surgery. The goal is to lower IOP by improving aqueous humor outflow, reducing aqueous humor production, or a combination of both. In acute PACG, topical or systemic medications such as beta-blockers, alpha agonists, or prostaglandin analogs can be used to lower IOP. Laser iridotomy or trabeculectomy may be required if medical therapy fails.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not address the underlying cause of PACG, which is the blockage of the drainage angle by the iris.
**Option B:** This option may be incorrect as it does not specify the type of glaucoma being treated and may be more relevant to open-angle glaucoma.
**Option C:** This option is incorrect as it is a treatment for open-angle glaucoma, which has a different pathophysiology than PACG.

**Clinical Pearl / High-Yield Fact**
In patients with PACG, a laser iridotomy is often performed to create a hole in the iris, allowing aqueous humor to flow through and reducing IOP. This procedure is typically performed under local anesthesia and can be done in an outpatient setting.

**Correct Answer: C. Acetazolamide**