A disorder in which intruding thoughts that occur again and again are followed by repetitive, ritualistic behavior meant to lower the anxiety caused by the thoughts is called __________ disorder.

A) obsessive-compulsive
B) delusional
C) post-traumatic stress
D) passive-aggressive

Obsessive-compulsive disorder (OCD) is characterized by recurrent, intrusive thoughts (obsessions) that are followed by repetitive behaviors or mental acts (compulsions) that are intended to alleviate anxiety or prevent a dreaded event. The compulsions are not realistically tied to the feared outcome, but are rather excessive and irrational ways of coping with the anxiety associated with the obsessive thoughts. Delusional disorder involves false beliefs that are maintained despite evidence to the contrary, while post-traumatic stress disorder (PTSD) involves distress and avoidance behaviors following exposure to a traumatic event. Passive-aggressive behavior is a personality style involving avoidance of direct confrontation and the use of indirect means to express anger or hostility.