A key property of opioid drugs which underlies their addiction ...

[HudsonKB16]

A key property of opioid drugs which underlies their addiction liability is their ability to indirectly activate ___________________ ______ neurons projecting to the nucleus accumbens.
 
  a. cholinergic
  b. serotonergic
  c. noradrenergic
  d. dopaminergic

Question 2

Opiates have the greatest clinical efficacy in reducing ___________________ _____.
 
  a. sharp, fast onset pain induced by a noxious stimulus
  b. dull, aching pain that persists after a noxious stimulus has been applied
  c. both sharp, fast onset and dull, aching pain to a comparable degree
  d. non-emotional pain

[underwood14]

Answer to Question 1

d

Answer to Question 2

b