**Core Concept**
The management of postprandial glycaemia involves various factors that can either increase or decrease blood glucose levels after a meal. **Postprandial glycaemia** refers to the elevation of blood glucose levels after eating, and it is an important aspect of diabetes management. Understanding the factors that influence postprandial glycaemia is crucial for the effective control of blood glucose levels.

**Why the Correct Answer is Right**
To answer this question correctly, one needs to consider the effects of different factors on postprandial glycaemia. Factors such as **dietary fiber**, **protein**, and **healthy fats** can help reduce postprandial glycaemia by slowing down the digestion and absorption of carbohydrates, thereby preventing a rapid spike in blood glucose levels.

**Why Each Wrong Option is Incorrect**
**Option A:**
**Option B:**
**Option C:**
Since the actual options are not provided, let's consider general factors: factors like **alpha-glucosidase inhibitors** and **physical activity** are known to reduce postprandial glycaemia, making them incorrect as the answer to this question.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **lifestyle modifications**, including diet and exercise, play a significant role in managing postprandial glycaemia. Understanding how different food components and physical activity impact blood glucose levels can help in making informed decisions for diabetes management.

**Correct Answer:** Correct Answer: D. Guarana.