Naloxone (Narcan) is a fast and powerful treatment for opiate overdoses. It functions by acting as an antagonist at opioid receptors

What is the function of naloxone (Narcan) in treating opiate overdoses?
a. Acting as an agonist at opioid receptors
b. Acting as an antagonist at opioid receptors
c. Acting as an agonist at do
d. None of the above