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Which of the following diseases is an autoimmune disorder?

1. Gout
2. Myasthenia gravis
3. Arthritis
4. Osteoporosis

Correct answer: Myasthenia gravis

Solution

Myasthenia gravis is an autoimmune disorder in which antibodies target acetylcholine receptors at the neuromuscular junction, causing muscle weakness. The other options are not classic autoimmune diseases: gout is due to uric acid crystals, osteoporosis is bone loss, and arthritis is a broad term with many causes.

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