Which among the following is not an autoimmune disease?
A. Myasthenia gravis
B. Systemic lupus erythematosus
C. Grave’s disease
D. Sickle cell disease
Correct answer : D. Sickle cell disease
Sickle cell disease is a genetic condition which is characterised by mutation in beta globin chain of hemoglobin (glutamic acid is replaced with valine in the 6th position of beta chain)