Of the following, which is most likely attributable to the effect of endorphins as described in the passage?
A.
After an injection of novocaine, a patient has no feeling in the area where the injection was given.
B.
After taking ibuprofen, a person with a headache gets quick relief.
C.
After receiving a local anesthetic, an injured person reports relief in the anesthetized area.
D.
After being given aspirin, a child with a badly scraped elbow feels better.
E.
After acupuncture, a patient with chronic back pain reports that the pain is much less severe.