14.1 A young man is brought into the emergency room. He is unconscious, and he has pupillary constriction and depressed respiration. You note needle marks on his legs. You administer naltrexone, and he awakens. This agent was effective because:

A. The patient was suffering from an overdose of a benzodiazepine.

B. Naltrexone antagonizes opiates at the receptor site.

C. Naltrexone is a stimulant of the CNS.

D. Naltrexone binds to the opioid and inactivates it.

E. The was was suffering from an overdose of meperidine.