## Core Concept
The treatment of Obsessive-Compulsive Disorder (OCD) primarily involves a combination of pharmacological and psychological interventions. The core concept here revolves around the use of medications and therapies that target the underlying neurobiological mechanisms of OCD. Selective serotonin reuptake inhibitors (SSRIs) are a first-line treatment due to their efficacy and relatively favorable side effect profile.

## Why the Correct Answer is Right
The correct answer, , involves the use of SSRIs, which are known to be effective in treating OCD. SSRIs work by increasing the levels of serotonin in the brain, which helps to reduce the symptoms of OCD. This is because OCD is believed to be associated with abnormalities in serotoninergic neurotransmission. By enhancing serotonin levels, SSRIs can help alleviate the obsessive and compulsive symptoms characteristic of OCD.

## Why Each Wrong Option is Incorrect
- **Option A:** - This option is incorrect because while cognitive-behavioral therapy (CBT), particularly exposure and response prevention (ERP), is indeed an effective treatment for OCD, the question seems to focus on a pharmacological or a specific type of intervention.
- **Option B:** - This option is incorrect as it does not accurately represent a commonly recognized first-line treatment for OCD.
- **Option D:** - This option is incorrect because, although antipsychotics may be used in some cases of OCD, especially when patients do not respond to SSRIs or have certain comorbid conditions, they are not considered a first-line treatment.

## Clinical Pearl / High-Yield Fact
A key point to remember is that in the treatment of OCD, SSRIs are considered first-line pharmacological agents. Additionally, it's crucial to note that approximately 50-60% of patients with OCD will respond to SSRIs, and another 20-30% may benefit from augmentation strategies, such as adding clomipramine (a TCA) or atypical antipsychotics.

**Correct Answer: C. **