## **Core Concept**
Fructose is a simple sugar that requires specific transport mechanisms to be absorbed and utilized by the body. The primary site for fructose absorption is the small intestine. The transport of fructose involves facilitated diffusion.

## **Why the Correct Answer is Right**
The correct answer, **GLUT5 (D)**, is right because GLUT5 (Glucose Transporter Type 5) is a fructose transporter that facilitates the diffusion of fructose across the intestinal epithelial cells. GLUT5 is highly specific for fructose and plays a crucial role in the absorption of dietary fructose in the small intestine. This transporter does not require insulin for its action, unlike some other glucose transporters.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is blank and does not provide a valid transporter for comparison.
- **Option B:** This option is also blank and does not offer a viable alternative for fructose transport.
- **Option C:** Similarly, this option is blank and lacks a specific transporter for fructose.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that GLUT5 is not only crucial for fructose absorption but also that its deficiency or impaired function can lead to issues with fructose metabolism. Additionally, GLUT5 is also expressed in other tissues like the testes, where it plays a role in spermatogenesis.

## **Correct Answer: D. GLUT5**