**Core Concept**
The Oral Rehydration Solution (ORS) is a mixture of water, salts, and sugars designed to treat dehydration caused by diarrhea, vomiting, or other fluid losses. ORS works by replenishing the lost salts and water in the body, thereby maintaining electrolyte balance and preventing dehydration.

**Why the Correct Answer is Right**
ORS typically contains sodium chloride, glucose, potassium chloride, and trisodium citrate as its main components. The correct answer will be an ingredient not included in the standard ORS formulation. The mechanism of ORS involves the absorption of sodium and glucose in the small intestine, which helps to replenish the body's fluids and electrolytes.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might be a common ingredient in ORS, but we'll have to wait and see if it's the correct answer.
**Option B:** This might be another common ingredient, but let's examine the options carefully before making a decision.
**Option C:** This could be the correct answer, but we need to confirm by evaluating the other options as well.

**Clinical Pearl / High-Yield Fact**
One of the key components of ORS is glucose, which helps to stimulate the absorption of sodium and water in the small intestine. This is known as the "sodium-glucose cotransport" mechanism.

**Correct Answer: C.