13. "addiction" has been defined as "dependence on and abuse of a psychoactive substance" Dependence and abuse do not always go hand in hand, however. For example, cancer patients can become dependent on morphine to relieve their pain, but this is not abusing the drug. Correspondingly, a person can abuse a drug without being dependent on it. Therefore, the definition of "addiction" is incorrect.
The relevance of the example of cancer patients to the argument depends on the assumption that
(A) cancer patients never abuse morphine
(B) cancer patients often become dependent on morphine
(C) cancer patients who are dependent on morphine are addicted to it
(D) cancer patients who abuse a drug are dependent on it
(E) cancer patients cannot depend on morphine without abusing it
