Question

Which one of the following is not an autoimmune disease?

• A. Grave's disease
• B. Pernicious anemia
• C. Rheumatoid arthritis
• D. Insomnia

Answer 1

The correct option is D Insomnia

Grave's disease is an immune system disorder that results in the overproduction of thyroid hormones.
Pernicious anemia is a type of vitamin B${}_{12}$ deficiency and is a kind of autoimmune disorder.
Rheumatoid arthritis is an autoimmune disease, that causes chronic inflammation of the joints.
Insomnia is a sleep disorder, that is characterized by difficulty falling or staying asleep and do not harm bodies own cells. It is caused by the psychiatric or medical conditions.
Thus, the correct answer is option D.