Which of the following are Autoimmune disorders?

A. Myasthenia gravis                    B. Rheumatoid arthritis

C. Gout                                              D. Muscular dystrophy

E. Systemic Lupus Erythematosus (SLE)

Choose the most appropriate answer from the options given below:

The correct answer is A, B & E only.

To determine the correct options, let us examine the nature of each medical condition listed:
1. Myasthenia gravis (A): This is a chronic neuromuscular autoimmune disorder. The immune system mistakenly produces antibodies that attack and block acetylcholine receptors at the neuromuscular junction, resulting in progressive skeletal muscle weakness and fatigue.
2. Rheumatoid arthritis (B): This is a chronic inflammatory autoimmune disease where the body's immune system attacks its own joint tissues, specifically the synovium (lining of the joints). This causes painful inflammation, joint damage, and potential deformity.
3. Gout (C): Gout is a metabolic disorder and a form of inflammatory arthritis, not an autoimmune disease. It is caused by hyperuricemia (excess uric acid in the blood), which leads to the deposition of monosodium urate crystals in joints, causing acute pain and swelling.
4. Muscular dystrophy (D): This is a group of hereditary genetic diseases, not an autoimmune condition. It is caused by gene mutations that interfere with the production of proteins (like dystrophin) necessary for building and maintaining healthy muscle tissue.
5. Systemic Lupus Erythematosus (SLE) (E): SLE is a systemic autoimmune disease in which the immune system attacks various tissues and organs, including the skin, joints, kidneys, brain, heart, and lungs.

Thus, the autoimmune disorders from the list are A, B, and E.