**Core Concept**
Wire loop lesions in glomeruli are a hallmark of lupus nephritis, characterized by the deposition of immune complexes and complement components, leading to the formation of subendothelial deposits. This results in the thickening of the glomerular basement membrane, giving it a "wire loop" appearance under microscopy.

**Why the Correct Answer is Right**
The correct answer is related to lupus nephritis, a common complication of systemic lupus erythematosus (SLE). The deposition of immune complexes, including antibodies and complement components, triggers an inflammatory response that damages the glomerular basement membrane, leading to the characteristic wire loop lesions. This process involves the activation of the complement system, specifically the classical pathway, and the subsequent deposition of immune complexes in the subendothelial space.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might be incorrect because wire loop lesions are not typically associated with membranous nephropathy, which is characterized by the thickening of the glomerular basement membrane due to the deposition of immune complexes on the epithelial side.

**Option B:** This option is incorrect because wire loop lesions are not typically associated with rapidly progressive glomerulonephritis (RPGN), which is characterized by a more rapid decline in renal function and the presence of crescentic glomerulonephritis.

**Option C:** This option might be incorrect because wire loop lesions are not typically associated with diabetes mellitus, which is characterized by the presence of Kimmelstiel-Wilson nodules and mesangial expansion.

**Clinical Pearl / High-Yield Fact**
Lupus nephritis can present with a wide range of clinical manifestations, including nephritic syndrome, nephrotic syndrome, and renal failure. The presence of wire loop lesions in the glomeruli is a key diagnostic feature of lupus nephritis and can be confirmed through immunofluorescence microscopy.

**Correct Answer: C. Lupus nephritis**