Which of the following neurotransmitters is commonly depressed in patients with obsessive compulsive disorder?

Which of the following is the most appropriate definition for the term "obsession" in relation to obsessive compulsive disorder?

Which of the following best represents the typical onset age for obsessive compulsive disorder?

If an individual displays behaviors consistent with trichotillomania (i.e. hair-pulling), then he or she would be classified under which of the following behavioral disorder subsets?

Recurrent thoughts, fears, impulses, and actions are the symptoms of __________.

While completing a ritual, such as the repeated locking and unlocking of the front door, an individual with obsessive-compulsive disorder would most likely feel which of the following?