A Client Arrives Unconscious in the Emergency Department in Respiratory

A client arrives unconscious in the emergency department in respiratory depression from an unknown drug overdose.To help diagnose the overdose,the client is given small doses of naloxone (Narcan) .What is the purpose of this action?

A) To help wake up the client to obtain the name of the drug
B) To help diagnosis if the overdose was an opioid drug
C) To prevent vomiting while the client is unconscious
D) To reduce the psychoactive effects of the drug overdose