Which of the following is an example of an autoimmune disorder?

• A. Type 2 diabetes
• B. Rheumatoid arthritis
• C. Hypertension
• D. Asthma

Answer: (B)

Rheumatoid arthritis is classified as an autoimmune disorder because it involves the immune system mistakenly attacking the body's own joint tissues. In this condition, the immune response generates inflammation that results in pain, swelling, and potential joint damage. It illustrates the core mechanism of autoimmune diseases, where the body’s defense system targets its own healthy cells, leading to chronic inflammation and various symptoms.

On the other hand, type 2 diabetes is primarily a metabolic disorder characterized by insulin resistance and is not classified as an autoimmune disease. Hypertension refers to high blood pressure and is a condition influenced by various factors, including lifestyle and genetics, but does not involve an autoimmune mechanism. Asthma, while an inflammatory condition affecting the airways, is classified as an allergic response rather than an autoimmune disorder, as it typically pertains more to hypersensitivity rather than to the immune system attacking self-tissues. Thus, rheumatoid arthritis stands out as the clear example of an autoimmune disorder among the options provided.