**Core Concept**
Mirtazapine is an atypical antidepressant that acts as a noradrenergic and specific serotonergic antidepressant (NaSSA). It increases central noradrenergic and serotonergic activity by blocking alpha-2 adrenergic autoreceptors and serotonin 5-HT2 and 5-HT3 receptors, respectively.

**Why the Correct Answer is Right**
Mirtazapine's mechanism of action involves the blockade of alpha-2 adrenergic receptors, which leads to an increase in noradrenergic neurotransmission. This is achieved by preventing the negative feedback inhibition of noradrenergic neurons by alpha-2 adrenergic receptors, resulting in increased release of norepinephrine. Additionally, mirtazapine blocks 5-HT2 and 5-HT3 receptors, which enhances serotonergic neurotransmission. This dual action is thought to contribute to its antidepressant effects.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe mirtazapine's mechanism of action.
**Option B:** This option is incorrect as mirtazapine is not primarily a selective serotonin reuptake inhibitor (SSRI).
**Option C:** This option is incorrect as mirtazapine is not a monoamine oxidase inhibitor (MAOI).

**Clinical Pearl / High-Yield Fact**
Mirtazapine is known for its unique side effect profile, which includes increased appetite and weight gain due to its antagonist activity at histamine H1 receptors.

**Correct Answer: None provided. Please provide the options for a complete explanation.**