ORS contains how much potassium-

**Core Concept**
The World Health Organization (WHO) recommends the use of Oral Rehydration Solution (ORS) to treat dehydration caused by diarrhea. ORS contains a specific concentration of electrolytes, including sodium, potassium, chloride, and glucose, to help the body reabsorb fluids and electrolytes.

**Why the Correct Answer is Right**
ORS contains 20-25 mmol/L of potassium, which is essential for maintaining proper hydration and preventing hypokalemia. The addition of potassium helps to replenish lost potassium ions and supports the functioning of various cellular processes. The potassium content in ORS is carefully balanced to prevent hyperkalemia, while also ensuring that the body receives adequate amounts of this essential electrolyte.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because ORS typically contains a concentration of 20-25 mmol/L of potassium, not 10-15 mmol/L.
**Option B:** This option is incorrect because ORS does not contain 50-60 mmol/L of potassium, which would be excessive and potentially lead to hyperkalemia.
**Option C:** This option is incorrect because ORS does not contain 5-10 mmol/L of potassium, which would be insufficient to treat dehydration and electrolyte imbalances.

**Clinical Pearl / High-Yield Fact**
It's essential to note that ORS should be used in conjunction with other treatments, such as rest, hydration, and antibiotics if necessary, to effectively manage dehydration and electrolyte imbalances caused by diarrhea.

**Correct Answer:** C. 20-25 mmol/L