DSM-IV-TR is a guide to clinical practice to facilitate research,
improve communication among clinicians and researches, and serve as an
educational tool. It is theoretical approach to diagnosis and management. It does
not reflect the etiology of mental disorders.
The right answer is B) cause of a psychological disorder.
The DSM-IV, the Diagnostic and Statistical Manual of Mental Disorders, was published by the American-Psychiatric Association in 1994. It has been revised (DSM-IV-TR) in a minor way.
The DSM categorizes all the mental disorders (or psychiatric) recognized by the association and describes their diagnostic criteria. It is widely adopted internationally.