## **Core Concept**
Rhopressa, also known as netarsudil, is a medication used in the treatment of glaucoma. It belongs to a new class of drugs that target specific pathways involved in intraocular pressure (IOP) regulation. Understanding its mechanism of action is crucial for managing glaucoma effectively.

## **Why the Correct Answer is Right**
The correct answer, **D. Rho kinase inhibitor**, explains that netarsudil works by inhibiting the Rho kinase pathway. This pathway plays a significant role in the contraction of smooth muscle cells, including those in the trabecular meshwork and Schlemm's canal, which are critical for aqueous humor outflow. By inhibiting this pathway, netarsudil increases the outflow of aqueous humor, thereby reducing intraocular pressure.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because prostaglandin analogs work by increasing the uveoscleral outflow of aqueous humor, a different mechanism from that of netarsudil.
- **Option B:** This option is incorrect as carbonic anhydrase inhibitors work by reducing aqueous humor production, not by affecting the outflow directly like netarsudil.
- **Option C:** This option is incorrect because beta-blockers decrease intraocular pressure by reducing the production of aqueous humor, not by enhancing its outflow.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that netarsudil (Rhopressa) offers a novel approach to glaucoma treatment by targeting the Rho kinase pathway, providing an alternative for patients who may not respond well to or tolerate traditional glaucoma therapies.

## **Correct Answer:** D. Rho kinase inhibitor.