Which of the following is not an autoimmune disease?

- Rheumatoid arthritis, Psoriasis, and Vitiligo are all autoimmune disorders where the body's immune system attacks its own cells.$\text{Alzheimer’s}$ disease is a neurodegenerative disorder characterized by the accumulation of amyloid plaques and neurofibrillary tangles in the brain, primarily linked to aging and genetics rather than an autoimmune attack.