## Core Concept
Latanoprost is a prostaglandin F2α analogue used primarily in the treatment of glaucoma and ocular hypertension. It works by increasing the outflow of aqueous humor, thereby reducing intraocular pressure (IOP). This mechanism is crucial for managing conditions where elevated IOP can lead to optic nerve damage.

## Why the Correct Answer is Right
Latanoprost acts by stimulating the prostaglandin F2α receptors in the eye, which enhances the uveoscleral outflow of aqueous humor. This results in a decrease in intraocular pressure, a key factor in the progression of glaucoma. The effectiveness of latanoprost in reducing IOP makes it a valuable option for patients with glaucoma or ocular hypertension.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because latanoprost is not a beta-blocker; it belongs to the class of prostaglandin analogues. Beta-blockers, such as timolol, reduce IOP by decreasing the production of aqueous humor.
- **Option B:** This option is incorrect as latanoprost does not work by inhibiting carbonic anhydrase. Agents like acetazolamide act by inhibiting carbonic anhydrase, which reduces aqueous humor production.
- **Option C:** This option might seem plausible but is incorrect because latanoprost's primary mechanism is not through muscarinic receptor agonism. Pilocarpine, for example, is a muscarinic receptor agonist that increases the outflow of aqueous humor by contracting the ciliary muscle.

## Clinical Pearl / High-Yield Fact
A key clinical pearl regarding latanoprost is that it can cause changes in iris pigmentation and eyelash growth. Patients on latanoprost may notice darkening of the iris and an increase in the length and thickness of eyelashes. This is a notable side effect that clinicians should discuss with patients starting this medication.

## Correct Answer Line
**Correct Answer: D.** Latanoprost is a prostaglandin analogue.