Which of the following neurotransmitters is NOT discussed as a possible contributor to major depressive disorder?

A psychiatrist compared the records of patients diagnosed with depression only with those of patients diagnosed with depression and another disorder. What will her analysis reveal?

a) Depression as the sole diagnosis is associated with a longer course of illness. b) Depressed people with comorbid diagnoses tend to have a longer course of their illness. c) Depression as the sole diagnosis is more likely to respond to antidepressant medications. d) Depression with comorbid conditions is more likely to respond to antidepressant medications.

People who lie, cheat, steal, show little or no sense of responsibility, and no guilt or remorse for their behavior have ______ personality disorder

a. borderline c. schizoid b. paranoid d. antisocial