## Core Concept
The question tests knowledge of anxiolytic drugs, specifically those not interacting with the GABAergic system, and their use in generalized anxiety disorder (GAD). Anxiolytics, or anti-anxiety drugs, are used to treat anxiety disorders, and they can act through various mechanisms.

## Why the Correct Answer is Right
The correct answer, , is Buspirone. Buspirone is an anxiolytic drug that is used in the treatment of generalized anxiety disorder (GAD). Unlike many other anxiolytics, buspirone does not interact with the GABAergic system. Instead, it acts as a **serotonin 5-HT1A receptor partial agonist**. This mechanism is distinct from the typical benzodiazepines, which enhance the effect of the neurotransmitter gamma-aminobutyric acid (GABA) at the GABA_A receptor, leading to sedative, hypnotic (sleep-inducing), anxiolytic (anti-anxiety), anticonvulsant, and muscle relaxant properties.

## Why Each Wrong Option is Incorrect
- **Option A:** This option could potentially represent a benzodiazepine or another GABAergic anxiolytic, which does interact with the GABAergic system, making it incorrect based on the question's criteria.
- **Option B:** This could represent another class of drugs, but without specifics, it's hard to address directly. However, if it acts through the GABAergic system or isn't used for GAD, it would be incorrect.
- **Option D:** This option might represent another anxiolytic or drug used in anxiety but does not fit the description provided for the correct answer.

## Clinical Pearl / High-Yield Fact
A key point to remember is that buspirone is unique because it does not cause sedation or dependence, which are common issues with traditional anxiolytics like benzodiazepines. Buspirone's onset of action is also slower compared to benzodiazepines, and it is specifically indicated for generalized anxiety disorder without significant sedative effects.

## Correct Answer Line
**Correct Answer: C. Buspirone.**