The Patient Receives Morphine for Pain

The patient receives morphine for pain. He asks the nurse how it works to relieve pain. What is the best response by the nurse?

A) "It inhibits the primary pain neurotransmitters in your brain."
B) "It stimulates the receptors that secrete endorphins in your brain."
C) "It interacts with receptors in your body that produce analgesia."
D) "It promotes the primary pleasure neurotransmitters in your brain."