**Core Concept**
Selective serotonin reuptake inhibitors (SSRIs) are a class of antidepressant medications that work by inhibiting the reuptake of serotonin, thereby increasing its availability in the synaptic cleft. They are commonly used to treat various psychiatric conditions, including depression, anxiety disorders, and panic disorder.

**Why the Correct Answer is Right**
The correct answer is a SSRI that is specifically approved for the treatment of panic disorder. This medication has been shown to be effective in reducing the frequency and severity of panic attacks, as well as improving symptoms of anxiety and depression. It works by increasing the levels of serotonin in the brain, which helps to regulate mood and reduce anxiety.

**Why Each Wrong Option is Incorrect**
**Option A:** This medication is not specifically approved for the treatment of panic disorder, although it may be used off-label for this indication.
**Option B:** This medication is a tricyclic antidepressant (TCA) rather than an SSRI, and is not typically used as a first-line treatment for panic disorder.
**Option C:** This medication is an SSRI, but it is not typically used as a first-line treatment for panic disorder due to its side effect profile.
**Option D:** This medication is not an SSRI and is not typically used for the treatment of panic disorder.

**Clinical Pearl / High-Yield Fact**
SSRIs are generally considered a safer and more effective treatment option for panic disorder than TCAs, which are associated with a higher risk of side effects and toxicity.

**Correct Answer: A. Paroxetine**