**Core Concept**
Cluster B personality disorders are characterized by dramatic, emotional, or erratic behavior. They include disorders such as borderline personality disorder, histrionic personality disorder, narcissistic personality disorder, and antisocial personality disorder. These disorders are marked by intense emotional dysregulation, impulsivity, and a tendency to engage in self-damaging behaviors.

**Why the Correct Answer is Right**
Narcissistic personality disorder is a Cluster B personality disorder that is characterized by a grandiose sense of self-importance, a fixation with fantasies of unlimited success, power, brilliance, beauty, or ideal love, and a need for constant admiration. Individuals with this disorder have difficulty empathizing with others and may engage in manipulative or exploitative behavior to achieve their goals. The diagnostic criteria for narcissistic personality disorder include a pervasive pattern of grandiosity, need for admiration, and a lack of empathy.

**Why Each Wrong Option is Incorrect**
**Option A:** Schizoid personality disorder is a Cluster A personality disorder, which is characterized by a lack of interest in social relationships, a tendency towards being a loner, and an inability to experience pleasure. This disorder is distinct from Cluster B personality disorders in terms of its symptoms and diagnostic criteria.

**Option C:** Dependent personality disorder is a Cluster C personality disorder, which is characterized by a pervasive and excessive need to be taken care of, which leads to submissive and clinging behavior. Individuals with this disorder have difficulty making decisions without excessive reassurance and may become overly reliant on others for emotional support.

**Option D:** Antisocial personality disorder is actually a Cluster A personality disorder, but it is not listed among the options. However, if we consider the closest option, it is still incorrect. Anantastic personality disorder is not a recognized personality disorder in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5). The correct term is "Antisocial personality disorder."

**Clinical Pearl / High-Yield Fact**
When evaluating a patient for a personality disorder, it is essential to consider the individual's behavior patterns and how they impact their relationships and daily functioning. A comprehensive psychiatric evaluation, including a thorough history and mental status examination, is crucial for making an accurate diagnosis.

**✓ Correct Answer: B. Narcissistic personality disorder**