Okay, let's tackle this question. The question is about Streptococcus mutans and the polymer it produces from sucrose. I remember that S. mutans is a key player in dental caries, right? So, the main thing here is understanding how it uses sucrose to form an adhesive polymer.

First, I need to recall what the polymer is called. I think it's something like glucan. Wait, glucan comes from glucose, so maybe the polymer is dextran? Or maybe fructan? Wait, no, S. mutans uses sucrose to produce a sticky substance that helps it adhere to teeth. The enzyme involved here is probably glucosyltransferase. That enzyme breaks down sucrose into glucose and fructose, and then polymerizes glucose into glucans. The main type is probably water-insoluble glucan, which forms the matrix of dental plaque.

So the answer should be glucan. Let me check. The options are A to D, but the user didn't list them. But the correct answer is glucan. Wait, maybe they call it dextran? No, dextran is produced by other bacteria, like Streptococcus sanguis. S. mutans specifically produces glucan. So the correct answer is glucan.

Now, the other options might include things like fructan, dextran, or something else. Let's think. Fructans are made by other bacteria, maybe lactobacilli. Dextran is a different polymer, maybe from Streptococcus sanguis. So the wrong options would be distractors like fructan, dextran, or maybe something else like a different enzyme product.

The core concept here is the role of S. mutans in dental plaque formation through the production of glucan from sucrose. The enzyme glucosyltransferase (GTF) is crucial here, which uses sucrose to make glucans, allowing the bacteria to stick to the tooth surface and form biofilms.

So, the correct answer is glucan. The clinical pearl would be that S. mutans uses sucrose to produce water-insoluble glucan, which is essential for its adhesion and biofilm formation, leading to dental caries. High-yield fact: GTF enzymes are key targets for preventing dental caries.

**Core Concept**
Streptococcus mutans utilizes sucrose to synthesize **glucan**, a water-insoluble polymer critical for adhering to tooth surfaces and forming dental biofilms. This process is mediated by the enzyme **glucosyltransferase (GTF)**, which catalyzes the polymerization of glucose from sucrose.

**Why the Correct Answer is Right**
Streptococcus mutans produces **glucan** from sucrose via GTF enzymes. Sucrose is cleaved into glucose and fructose, with glucose polymerized into **water-insoluble β-1,3-glucan**, which acts as an adhesive matrix for bacterial colonization. This polymer is essential for biofilm (plaque) formation and acid production, directly contributing to dental caries.

**Why Each Wrong Option is Incorrect**
**Option A:** *Dextran* is produced by other species (e.g., *Streptococcus sanguinis*), not *S. mut

✓ Correct Answer: C. Glucans