WHO ORS contains –
**Core Concept**
The World Health Organization's Oral Rehydration Solution (WHO ORS) is a formulation designed to treat dehydration caused by diarrhea, especially in children. It is a balanced mixture of electrolytes and carbohydrates that helps maintain fluid and electrolyte balance in the body.
**Why the Correct Answer is Right**
WHO ORS contains sodium (Na+) and chloride (Cl-) ions, which are essential electrolytes lost in excess during diarrhea. The solution also contains glucose, which helps the intestine absorb sodium and water more efficiently. The combination of glucose and sodium in ORS stimulates the sodium-glucose cotransporter 1 (SGLT1) in the intestinal epithelium, promoting the absorption of sodium, glucose, and water.
**Why Each Wrong Option is Incorrect**
**Option A:** The correct answer is not sodium chloride, although it is a component of ORS. The question asks for the full composition of WHO ORS.
**Option B:** The correct answer is not glucose alone, as glucose is only one component of the solution.
**Option C:** The correct answer is not potassium chloride, as potassium is indeed present in ORS but is not the primary component.
**Clinical Pearl / High-Yield Fact**
Remember the "Glucose-Sodium-Potassium" (GSP) formula when thinking about ORS composition: Glucose helps absorb Sodium and Potassium in the intestine.
**Correct Answer: D. Sodium Chloride, Glucose, Potassium Chloride.**