**Core Concept:** Obsessive-Compulsive Disorder (OCD) is a psychiatric disorder characterized by persistent and recurrent obsessions and/or compulsions that interfere with daily functioning. OCD is often treated with selective serotonin reuptake inhibitors (SSRIs), which are a class of antidepressants that target serotonin reuptake inhibition.

**Why the Correct Answer is Right:** The correct answer, D, represents a specific class of antidepressants that are not typically used for treating OCD: tricyclic antidepressants (TCAs). TCAs act on multiple neurotransmitter systems, including serotonin, norepinephrine, and dopamine. In contrast, SSRIs are selective for serotonin reuptake inhibition, making them more effective in treating OCD symptoms.

**Why Each Wrong Option is Incorrect:**

A. Monoamine oxidase inhibitors (MAOIs) are another class of antidepressants that inhibit monoamine oxidase enzymes, leading to increased neurotransmitter availability. However, they are not typically used for treating OCD due to their potential for causing severe reactions when combined with certain foods or medications.

B. Benzodiazepines are a class of anxiolytics used for treating anxiety disorders, not OCD. They act on the GABA system, which is different from the serotonin system targeted by SSRIs and TCAs.

C. Benzodiazepines, like B, are not typically used for treating OCD. Although they may provide temporary symptom relief, they do not address the core neurotransmitter imbalances in OCD.

**Clinical Pearl / High-Yield Fact:** In clinical practice, it is crucial to differentiate between the various classes of antidepressants and their specific mechanisms of action. This understanding helps in selecting the most appropriate medication for treating a patient's condition, ensuring the best treatment outcomes and minimizing potential adverse effects.