This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
Which is not autoimmune disease 
Select and explain. 
A. SLE, B. Grave's disease, C. Myasthenia Gravis, D. Sickle cell disease
D: Sickle cell disease
Answer: D: Sickle cell disease 
Explanation: Examples of autoimmune diseases Sickle cell disease is caused by utations in the HBB gene cause sickle cell disease. It is a group of disorders that affects hemoglobin , the molecule in red blood cells that delivers oxygen to cells throughout the body. People with this disorder have atypical hemoglobin molecules called hemoglobin S, which can disto red blood cells into a sickle, or crescent, shape. Ref - Davidson's medicine 20e , researchgate.net