Paul is a fifty-five-year-old man who has been having some difficulty recalling important details. On visiting a doctor, he was told that he was in the early stages of Alzheimer's disease. The deficiency of__________is most likely to be linked to Paul's condition.

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Alzheimer's disease is characterized by a deficiency of acetylcholine, a neurotransmitter that is involved in learning and memory processes. This deficiency is thought to be linked to the cognitive decline observed in individuals with Alzheimer's disease. Prolactin, serotonin, and gamma-aminobutyric acid are not implicated in the development of Alzheimer's disease.

Paul Is a Fifty-Five-Year-Old Man Who Has Been Having Some