**Core Concept**
Nateglinide is a second-generation meglitinide, a class of oral hypoglycemic agents used in the treatment of type 2 diabetes mellitus. These medications stimulate insulin secretion from the pancreatic beta cells.

**Why the Correct Answer is Right**
Nateglinide works by closing potassium channels in the beta cells, leading to an influx of calcium ions and subsequent insulin release. This action is mediated by the ATP-sensitive potassium channels, specifically the sulfonylurea receptor 1 (SUR1) and the inwardly rectifying potassium channel (Kir6.2). Nateglinide has a short duration of action, which allows for rapid onset and offset of insulin secretion.

**Why Each Wrong Option is Incorrect**
**Option A:** This statement is true as nateglinide is used to treat type 2 diabetes mellitus.
**Option B:** This statement is true as nateglinide stimulates insulin secretion from the pancreatic beta cells.
**Option C:** This statement is false as nateglinide has a short duration of action, whereas glipizide has a longer duration of action.

**Clinical Pearl / High-Yield Fact**
Meglitinides, including nateglinide, are more commonly used in patients with postprandial hyperglycemia due to their short duration of action, allowing for rapid correction of blood glucose levels after meals.

**Correct Answer: C. Nateglinide has a long duration of action.**