To solve this problem, we need to identify which of the given options is not an autoimmune disease. Let's analyze each option:$\newline \bullet$Alzheimer’s disease:$\newline$ - Alzheimer's disease is a neurodegenerative disorder characterized by progressive memory loss and cognitive decline.$\newline$ - It is not classified as an autoimmune disease.$\newline \bullet$Rheumatoid arthritis:$\newline$ - Rheumatoid arthritis is an autoimmune disease where the immune system mistakenly attacks the joints, causing inflammation and pain.$\newline$ - It is classified as an autoimmune disease.$\newline \bullet$Psoriasis:$\newline$ - Psoriasis is an autoimmune condition that results in the rapid growth of skin cells, leading to scaling and inflammation.$\newline$ - It is classified as an autoimmune disease.$\newline \bullet$Vitiligo:$\newline$ - Vitiligo is an autoimmune disorder where the immune system attacks the pigment-producing cells in the skin, leading to loss of skin color in patches.$\newline$ - It is classified as an autoimmune disease.$\newline$Based on the analysis, the correct answer is Option 1: Alzheimer’s disease, as it is not an autoimmune disease.