The DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, 5th edition) categorizes personality disorders into three clusters. These clusters are based on similar patterns of behaviour and symptoms. However, one of the following options is not one of the clusters:
1. Cluster A: This cluster includes personality disorders characterized by odd or eccentric behaviour. Examples of disorders in this cluster include paranoid personality disorder, schizoid personality disorder, and schizotypal personality disorder. Individuals with these disorders may exhibit unusual beliefs, social isolation, and difficulties in forming close relationships.
2. Cluster B: This cluster consists of personality disorders characterized by dramatic, emotional, or erratic behaviour. Disorders in this cluster include antisocial personality disorder, borderline personality disorder, histrionic personality disorder, and narcissistic personality disorder. Individuals with these disorders may display impulsive behaviour, intense and unstable relationships, and difficulties controlling emotions.
3. Cluster C: This cluster includes personality disorders characterized by anxious or fearful behaviour. Disorders in this cluster include avoidant personality disorder, dependent personality disorder, and obsessive-compulsive personality disorder. Individuals with these disorders may experience extreme fear of rejection, have a strong need for reassurance and support, and exhibit perfectionistic tendencies.
The option that is not one of the clusters is:- Cluster D: However, it's important to note that there is no Cluster D in the DSM-5. The DSM-5 categorizes personality disorders into three clusters, not four.