## Core Concept
Na-dependent glucose transport refers to the process by which glucose is absorbed in the intestines and reabsorbed in the kidneys, utilizing the sodium gradient across cell membranes. This process is crucial for glucose uptake in enterocytes and renal proximal tubule cells.

## Why the Correct Answer is Right
The correct answer, Phlorhizin (or phlorizin), is a naturally occurring inhibitor of sodium-glucose cotransporters (SGLTs), specifically SGLT1 and SGLT2. These transporters are responsible for Na-dependent glucose transport in the intestines and kidneys, respectively. By inhibiting these transporters, phlorhizin prevents glucose reabsorption in the kidneys and glucose absorption in the intestines.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is blank and does not provide a valid choice for consideration.
* **Option B:** This option is also blank and does not offer a legitimate inhibitor of Na-dependent glucose transport.
* **Option C:** Similarly, this option is blank and lacks a viable substance to assess its accuracy.
* **Option D:** This option is blank as well, failing to present a recognizable inhibitor of Na-dependent glucose transport.

## Clinical Pearl / High-Yield Fact
A key point to remember is that SGLT2 inhibitors, a class of drugs used in the treatment of type 2 diabetes, work similarly to phlorhizin by inhibiting glucose reabsorption in the kidneys, thereby increasing urinary glucose excretion. This mechanism highlights the importance of Na-dependent glucose transport in glucose homeostasis.

## Correct Answer: D. Phlorhizin.