This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
All of the following are autoimmune diseases, EXCEPT: 
Select and explain. 
A. SLE, B. Grave's disease, C. Myaesthenia gravis, D. Sickle Cell Disease
D: Sickle Cell Disease
Answer: D: Sickle Cell Disease 
Explanation: Sickle cell diease is not an autoimmune disease. Sickle Cell Disease is a structural hemoglobinopathy caused by a mutation in the f3-globin gene that changes the sixth ammoacid from glutamic acid to valine (HBS a2 B2 6Glu?Val), The mode of inheritance is autosomal recessive. Ref: Harrison 16th Edition, Page 678 ; Robbins Pathologic basis of disease 6th Edition, Page 611.