## Core Concept
Sulfonylureas are a class of medications used to manage type 2 diabetes mellitus. They act by stimulating the release of insulin from the pancreatic beta cells. This mechanism is crucial for lowering blood glucose levels in diabetic patients.

## Why the Correct Answer is Right
The correct answer, **C. Stimulation of insulin release from pancreatic beta cells**, is accurate because sulfonylureas work by binding to and closing ATP-sensitive potassium channels (K_ATP channels) in the pancreatic beta cells. This closure depolarizes the cell membrane, opens voltage-gated calcium channels, and leads to an influx of calcium ions. The increased intracellular calcium concentration triggers the exocytosis of insulin granules, thereby stimulating insulin release.

## Why Each Wrong Option is Incorrect
- **Option A: Inhibition of glucose absorption from intestine** - This is incorrect because sulfonylureas do not primarily act by inhibiting glucose absorption from the intestine. Their main action is on the pancreas.
- **Option B: Increase in insulin sensitivity** - This is incorrect because sulfonylureas do not primarily work by increasing insulin sensitivity. They directly stimulate insulin secretion.
- **Option D: Inhibition of hepatic glucose production** - This is incorrect because, although some antidiabetic drugs do work by inhibiting hepatic glucose production, sulfonylureas primarily act by stimulating insulin release.

## Clinical Pearl / High-Yield Fact
A key point to remember is that sulfonylureas can cause hypoglycemia as a side effect due to their insulin-stimulating action. This is particularly relevant in clinical practice, as it necessitates careful monitoring of blood glucose levels in patients taking these medications.

## Correct Answer: C. Stimulation of insulin release from pancreatic beta cells