## Core Concept
Cluster A personality disorders are characterized by odd or eccentric behavior. They are often marked by a lack of emotional expression and social interactions. The three main disorders in this cluster are Paranoid Personality Disorder, Schizoid Personality Disorder, and Schizotypal Personality Disorder.

## Why the Correct Answer is Right
The correct answer, , corresponds to Schizotypal Personality Disorder, which is one of the Cluster A personality disorders. This disorder is marked by acute discomfort with, and reduced capacity for, close relationships. It also involves cognitive or perceptual distortions and eccentricities of behavior.

## Why Each Wrong Option is Incorrect
* **Option A:** - This option does not correspond to any of the Cluster A personality disorders.
* **Option B:** - This option does not match any of the disorders classified under Cluster A.
* **Option D:** - This option is incorrect as it does not represent a Cluster A personality disorder.

## Clinical Pearl / High-Yield Fact
A key point to remember is that Cluster A personality disorders are considered to be on the schizophrenia spectrum, with Schizotypal Personality Disorder being particularly notable for its similarities to schizophrenia in terms of cognitive distortions and eccentric behavior.

## Correct Answer Line
**Correct Answer: C. Schizotypal Personality Disorder**