Final answer:
The term that is not related to hypnosis is Posthypnotic exhortation.
Step-by-step explanation:
Out of the given options, the term that is not related to hypnosis is (E) Posthypnotic exhortation. Posthypnotic amnesia refers to the inability to recall events or information that occurred during hypnosis after being brought out of the hypnotic state.
Hidden observer refers to the idea that even though a person is hypnotized, a part of them remains aware of what is happening. Suggestibility refers to the level of responsiveness to suggestions given during hypnosis. Hypnotic analgesia refers to the reduction or elimination of pain sensation under hypnosis.