Which condition is a chronic autoimmune inflammatory disease of collagen affecting skin, joints, and internal organs?

• A. Chronic fatigue syndrome
• B. Systemic lupus erythematosus
• C. Mononucleosis
• D. Lymphedema

Answer: (B)

The main idea being tested is recognizing a systemic autoimmune condition that causes chronic inflammation in collagen-containing tissues like the skin, joints, and internal organs. The best choice is systemic lupus erythematosus, a chronic autoimmune disease where the immune system attacks multiple connective tissues. This leads to inflammation in the skin (often a butterfly-shaped facial rash and photosensitivity), joints (inflammatory arthritis), and internal organs such as the kidneys, heart, or lungs. It’s driven by autoantibodies and immune complex deposition, making it a classic example of a systemic inflammatory autoimmune process affecting various organ systems.

Other options don’t fit this pattern because they are not autoimmune inflammatory diseases that involve multiple organ systems: chronic fatigue syndrome is primarily fatigue without a defining inflammatory connective-tissue process; mononucleosis is a viral infection; lymphedema is swelling from lymphatic obstruction.