**Core Concept**
The World Health Organization's Oral Rehydration Solution (ORS) is a mixture of salts, sugars, and other ingredients designed to treat dehydration caused by diarrhea. Glucose plays a crucial role in enhancing the absorption of sodium in the small intestine.

**Why the Correct Answer is Right**
Glucose and sodium share the same transport mechanism in the small intestine, known as sodium-glucose cotransport. This mechanism involves the enzyme sodium-glucose cotransporter 1 (SGLT1), which is responsible for the uptake of both glucose and sodium ions. When glucose is present in the lumen, it binds to SGLT1, which then facilitates the uptake of sodium ions, thereby enhancing sodium absorption.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because glucose does not inhibit sodium absorption in ORS.
* **Option B:** This option is incorrect because glucose does not have a direct effect on the absorption of other electrolytes like potassium.
* **Option C:** This option is incorrect because glucose does not have a role in the absorption of water in the small intestine.

**Clinical Pearl / High-Yield Fact**
The sodium-glucose cotransport mechanism highlights the importance of glucose in enhancing sodium absorption in ORS, making it a crucial component of the solution.

**Correct Answer: C. Glucose enhances sodium absorption in ORS by sharing the same transport mechanism.