<span>The answer is endonorphins. They are opotid peptide hrmones and are poduced endogenously. Endonorphons inhibit transmissions of the signals related to pain, and are also use in depersonalization treatments. They are screted in brain and nervous system and cause an analgesic effect in the body.</span>
I think it's C because he acts suitable according to his age hut the little sister behaves selective.
Hope it helps!
#MissionExam001
