**Question:** Glucose transpo/reabsorption in the kidneys is inhibited by:

**Core Concept:** Glucose transport and reabsorption in the kidneys is a crucial process that helps maintain glucose homeostasis in the body. This process involves various transport proteins and mechanisms.

**Why the Correct Answer is Right:** Glucose reabsorption primarily occurs in the proximal convoluted tubules of the nephrons, where glucose is taken up into the bloodstream and transported back to the cells of the nephrons. The correct answer, **D-Phlorizin**, is a competitive inhibitor of glucose transport, specifically inhibiting the sodium-glucose co-transporter 2 (SGLT2). SGLT2 is responsible for reabsorbing glucose from the renal tubules into the bloodstream. Phlorizin competes with glucose for binding to SGLT2, thereby reducing glucose reabsorption and increasing glucose excretion in the urine.

**Why Each Wrong Option is Incorrect:**

A. **Furosemide (Option A):** Furosemide is a loop diuretic that indirectly increases glucose excretion in the urine by causing sodium and water loss, but it does not directly inhibit glucose transport, rendering it incorrect.

B. **Insulin (Option B):** Insulin is a hormone that lowers blood glucose levels by promoting glucose uptake into cells and inhibiting gluconeogenesis. It does not directly inhibit glucose transport in the kidneys, making it an incorrect answer.

C. **Amlodipine (Option C):** Amlodipine is a calcium channel blocker used to treat hypertension and angina. It does not directly inhibit glucose transport in the kidneys, rendering it an incorrect answer.

**Clinical Pearl:** Phlorizin is a naturally occurring compound found in fruits like apples and pears. It has been used historically as a potential therapy for type 2 diabetes mellitus due to its ability to increase glucose excretion in the urine. However, its use has been limited due to its poor bioavailability and potential side effects.

**Correct Answer:** D-Phlorizin (Option D) inhibits glucose transport in the kidneys, directly affecting glucose homeostasis in the body and thus making it the correct answer.