Please explain experts why the answer is 2nd option???

Dear student,
Please find below the answer:

The correct option is (2). This is because arthritis is both an inflammatory and autoimmune disease. Myasthenia gravis is a disease in which there is progressive degeneration in skeletal muscle. In tetany, there is a rapid spasm in muscle. Osteoporosis refers to a condition in which bone mass decreases.

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