What is the branch of psychology that is concerned with the study of abnormal behavior?

According to the article Going to Pot, about adolescent drug use, a person who is able to delay

gratification, is rational, anxious, predictable and lacks friends and social skills is most likely to belong to the drug use group called (a) abstainers (b) resisters (c) experimenters (d) frequent users

The fact that cocaine use increased dopamine activation means that cocaine usage often results in symptoms that are similar to:

a. panic disorder. b. depression. c. schizophrenia. d. post- traumatic stress disorder.