## **Core Concept**
Cetirizine is a third-generation non-sedating **histamine H1 receptor antagonist** used primarily for the treatment of **allergic rhinitis** and **chronic idiopathic urticaria**. It works by selectively blocking peripheral H1 receptors, thereby reducing allergic symptoms.

## **Why the Correct Answer is Right**
The correct answer, option D, implies there is a statement about cetirizine that is not true among the provided choices. Since the actual statements for A, B, C, and D are not provided, we'll proceed with a general understanding that cetirizine is known for its efficacy in treating allergies with a low incidence of sedation due to its selective action on peripheral H1 receptors.

## **Why Each Wrong Option is Incorrect**
Without specific details on options A, B, and C, we can still discuss general incorrect statements about cetirizine:
- **Option A:** If A states cetirizine is used for allergic rhinitis, this is true.
- **Option B:** If B mentions cetirizine has a low risk of sedation, this is also true due to its selective peripheral action.
- **Option C:** If C notes cetirizine is a third-generation antihistamine, this is accurate.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that despite being a non-sedating antihistamine, cetirizine can still cause **sedation** in some individuals, especially at higher doses. This is a critical clinical pearl as it helps in managing patient expectations and side effect profiles.

## **Correct Answer: D.**