<prompt> All of the following are autoimmune disease except?SLEGraves diseaseMyasthenia gravisSickle cell disease  <response>: 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. 