How Does Activating Opioid Receptors in the Medulla Reduce Pain

Multiple Choice

How does activating opioid receptors in the medulla reduce pain?

A) The medulla is the pain center of the brain.
B) There is an inhibition of pain signals passing through the medulla to elsewhere in the brain.
C) There is a reduction in sympathetic nervous system activity, which makes someone less reactive to pain.
D) They produce rewarding effects which counteracts pain signals.