This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
All of the following are autoimmune disease except? 
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: Robbins basic pathology 6th edition. Chapter Red cells and bleeding disorders. page no. 611.. sickle cell disease is a hereditary hemoglobinopathy, occuring due to mutation in beta globin chain. while all others are autoimmne diseases. so, answer is option 4.