## **Core Concept**
Osmotic solutions can be classified based on their tonicity relative to human blood, which has an osmolarity of approximately 300 mOsm/L. A hypertonic solution has a higher osmolarity than blood.

## **Why the Correct Answer is Right**
The correct answer, , is hypertonic because its osmolarity is greater than 300 mOsm/L. For a solution to be considered hypertonic, it must have a higher concentration of solutes than human blood.

## **Why Each Wrong Option is Incorrect**
* **Option A:** is isotonic if its osmolarity equals that of blood (approximately 300 mOsm/L), making it not hypertonic.
* **Option B:** would be hypotonic if its osmolarity is less than 300 mOsm/L, which does not match the definition of hypertonic.
* **Option C:** being isotonic or hypotonic would make it incorrect as a hypertonic solution.

## **Clinical Pearl / High-Yield Fact**
A key clinical point is that hypertonic solutions are used to treat conditions like cerebral edema because they help draw water out of cells, reducing swelling.

## **Correct Answer:** .