**Core Concept**
IgA nephropathy, also known as Berger's disease, is a kidney disease characterized by the deposition of IgA antibodies in the glomeruli, leading to inflammation and damage. It is a common cause of nephritic syndrome in children and young adults.

**Why the Correct Answer is Right**
IgA nephropathy is characterized by the deposition of IgA antibodies in the glomeruli, which is a result of the abnormal production of IgA1 molecules that are not properly glycosylated. This leads to the formation of immune complexes that deposit in the mesangium and cause inflammation. The disease often presents with hematuria, particularly after an upper respiratory tract infection.

**Why Each Wrong Option is Incorrect**
**Option A:** IgA nephropathy is not typically associated with rapid progressive glomerulonephritis (RPGN), which is a more aggressive form of kidney disease.
**Option B:** While IgA nephropathy can progress to end-stage renal disease, it is not typically associated with significant proteinuria, unlike other forms of glomerulonephritis.
**Option C:** IgA nephropathy is not typically associated with the presence of crescents in the glomeruli, which are a hallmark of RPGN.

**Clinical Pearl / High-Yield Fact**
IgA nephropathy is often associated with the presence of IgA deposits in the mesangium, which can be detected by immunofluorescence microscopy. This is a key diagnostic feature of the disease.

**Correct Answer:** C.