John believes he is more intelligent and handsome than most people. He expects others to do favors for him but he does not return these favors. He is also pompous and likes to talk about himself. John shows evidence of which personality disorder?

What evidence has been cited by scientists who propose that alcoholism is related to endogenous opioid production?

a. Alcohol is an opioid derivative. b. Rats given morphine refuse alcohol. c. The symptoms of withdrawal from alcohol and heroin are similar. d. Opioid-antagonists can reduce the subjective "high" of drinking.

What would be the BEST answer to give to parents of a child recently diagnosed with ADHD in response to their questions about what caused it?

A) "It is probably due to a brain malformation that can be corrected with surgery." B) "Family dysfunction and high levels of family stress cause ADHD." C) "It results from the reactions of others to a child who is just an active child." D) "Our best guess is that ADHD results from an interaction of several factors."