What is Rheumatoid arthritis? Make a study tool about this autoimmune disease.
a. Rheumatoid arthritis is a degenerative bone disease primarily affecting the elderly population.
b. Rheumatoid arthritis is an autoimmune disease causing chronic inflammation of the joints.
c. Rheumatoid arthritis is a viral infection commonly affecting the respiratory system.
d. Rheumatoid arthritis is a genetic disorder leading to abnormal growth of connective tissue.