Okay, let's tackle this question. The question is about how fructose is absorbed. I need to recall the mechanisms of monosaccharide absorption in the small intestine.

First, I remember that glucose and galactose are absorbed via active transport using the SGLT1 transporter. But fructose is different. I think it uses a different transporter. Wait, what's the sodium-dependent transporter called? Oh right, SGLT1 is for glucose and galactose. Fructose must use a different pathway. Maybe facilitated diffusion? The transporter for fructose is GLUT5, right? Or is it GLUT2?

Wait, no. Let me get this straight. GLUT5 is the primary transporter for fructose in the small intestine. It's a facilitated diffusion transporter, so it doesn't require sodium. Fructose moves down its concentration gradient. So the correct answer here should be facilitated diffusion via GLUT5.

Now, looking at the options. The options are labeled A to D, but they're not provided. However, based on common exam questions, the distractors might include active transport (like sodium-dependent) or other transporters like GLUT2. Let's say the options are: A. Active transport, B. Facilitated diffusion via GLUT5, C. Osmosis, D. Endocytosis. The correct answer would be B.

Why is A incorrect? Because active transport with sodium is for glucose and galactose. Fructose doesn't use sodium. C is incorrect because osmosis isn't a mechanism for monosaccharide absorption. D is wrong because endocytosis isn't used here.

Clinical pearl: Remember that fructose is absorbed via facilitated diffusion using GLUT5, unlike glucose and galactose which use SGLT1. This distinction is important for understanding malabsorption issues, like fructose malabsorption causing diarrhea.

**Core Concept**
Fructose absorption in the small intestine occurs via **facilitated diffusion** through the **GLUT5 transporter**, which does not require sodium cotransport. This differs from glucose and galactose absorption, which rely on **SGLT1 (sodium-glucose linked transporter 1)**.

**Why the Correct Answer is Right**
Fructose is absorbed by **GLUT5**, a facilitative glucose transporter located in the intestinal brush border. Unlike SGLT1-mediated active transport, GLUT5 relies on the concentration gradient, allowing fructose to diffuse into enterocytes. Once inside, fructose is transported to the bloodstream via **GLUT2**. This mechanism explains why fructose absorption is less efficient than glucose and can lead to malabsorption in excessive intake.

**Why Each Wrong Option is Incorrect**
**Option A:** Active transport via SGLT1 applies to glucose and galactose, not fructose.
**Option C:** Osmosis is irrelevant for monosaccharide absorption.
**Option D:** Endocytosis is not a mechanism for nutrient absorption in the intestine.

**Clinical Pearl / High-Yield Fact**
Remember **“GLUT5 = fructose”** and **“SGLT1 = glucose/galactose”**. Fructose malabsorption (e.g., in hereditary fructose intolerance) causes osmotic diarrhea due to unabsorbed fructose drawing water into the lumen.

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✓ Correct Answer: B. Facilitated diffusion