**Core Concept**
Systemic Lupus Erythematosus (SLE) is a chronic autoimmune disorder characterized by the production of autoantibodies against various self-antigens, leading to inflammation and damage to multiple organs. The clinical features of SLE are diverse and can involve the skin, joints, kidneys, and other systems.

**Why the Correct Answer is Right**
The clinical features of SLE are numerous and can include malar rash, discoid lupus, photosensitivity, arthritis, serositis, nephritis, and neuropsychiatric manifestations. These features arise from the immune complex deposition and subsequent inflammatory response in affected tissues. The kidneys are a common site of involvement, where immune complexes deposit and trigger inflammation, leading to glomerulonephritis.

**Why Each Wrong Option is Incorrect**
**Option A:** Not a clinical feature of SLE, but can be seen in other autoimmune diseases like Rheumatoid Arthritis (RA).
**Option B:** A common clinical feature of SLE, characterized by inflammation of the pleura or pericardium.
**Option C:** Not a clinical feature of SLE, but can be seen in conditions like Sjögren's syndrome or RA.
**Option D:** A common clinical feature of SLE, characterized by inflammation of the kidneys.

**Clinical Pearl / High-Yield Fact**
One of the key differences between SLE and other autoimmune diseases is the presence of anti-nuclear antibodies (ANA) in the majority of SLE patients. This is a useful diagnostic clue, but not a definitive one, as ANA can also be present in healthy individuals.

**Correct Answer: C.**