Which disorder is characterized by insidious onset, often progressive course that is not usually reversible, clear consciousness until late stages, poor memory, possible visual or auditory hallucinations, and often fixed paranoid delusions?

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Dementia is characterized by an insidious onset, progressive course, and is not usually reversible. It involves poor memory, possible hallucinations, and often fixed paranoid delusions, with clear consciousness until the late stages.

Which Disorder Is Characterized by Insidious Onset, Often Progressive Course