**Core Concept**
Bupropion is a centrally acting antidepressant that primarily functions as a norepinephrine-dopamine reuptake inhibitor (NDRI). This unique mechanism of action sets it apart from other antidepressants, which often target serotonin reuptake.

**Why the Correct Answer is Right**
Bupropion works by inhibiting the reuptake of norepinephrine and dopamine in the brain, thereby increasing their concentrations and enhancing their effects. This action is thought to contribute to its antidepressant and anxiolytic effects. Bupropion does not significantly affect serotonin reuptake, which is why it is less likely to cause sedation or weight gain compared to other antidepressants.

**Why Each Wrong Option is Incorrect**
* **Option A:** Incorrect because bupropion does not significantly affect serotonin reuptake, unlike many other antidepressants.
* **Option B:** Incorrect because bupropion's primary mechanism of action is not as a selective serotonin reuptake inhibitor (SSRI).
* **Option C:** Incorrect because bupropion is not a monoamine oxidase inhibitor (MAOI), which is a different class of antidepressants that work by inhibiting the enzyme responsible for breaking down monoamine neurotransmitters.

**Clinical Pearl / High-Yield Fact**
Bupropion is often used as a smoking cessation aid due to its ability to reduce cravings and enhance dopamine release, making it easier to quit smoking.

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