**Core Concept**
Tricyclic antidepressants (TCAs) are a class of medications used to treat major depressive disorder, characterized by their unique pharmacological profile. They primarily work by inhibiting the reuptake of serotonin and norepinephrine, increasing their availability in the synaptic cleft and enhancing neurotransmission.

**Why the Correct Answer is Right**
TCAs have several actions, including:
- **Inhibition of norepinephrine reuptake**: TCAs block the norepinephrine transporter, increasing the concentration of norepinephrine in the synaptic cleft, which enhances its action on adrenergic receptors.
- **Inhibition of serotonin reuptake**: TCAs also block the serotonin transporter, increasing the concentration of serotonin in the synaptic cleft, which enhances its action on serotonin receptors.
- **Anticholinergic effects**: TCAs have anticholinergic properties, which can lead to side effects such as dry mouth, blurred vision, and constipation.
- **Antihistaminic effects**: TCAs also have antihistaminic properties, which can contribute to side effects such as drowsiness and sedation.

**Why Each Wrong Option is Incorrect**
**Option A:** (no option A provided) - cannot evaluate
**Option B:** (no option B provided) - cannot evaluate
**Option C:** (no option C provided) - cannot evaluate
**Option D:** (no option D provided) - cannot evaluate

**Clinical Pearl / High-Yield Fact**
TCAs can cause a fatal arrhythmia known as **Torsades de Pointes** due to their quinidine-like effects on the heart. This is a high-yield fact for exam purposes, as it is a critical side effect that can be life-threatening.

**Correct Answer:** (no option provided)