**Core Concept**
Proliferative glomerular deposits refer to the accumulation of immune complexes and cellular proliferation within the glomeruli, which are the filtering units of the kidney. This condition is often associated with various forms of glomerulonephritis, including lupus nephritis and post-streptococcal glomerulonephritis.

**Why the Correct Answer is Right**
The correct answer involves the presence of immune complexes, which are formed when antibodies bind to antigens. These immune complexes can deposit in the glomeruli, triggering an inflammatory response and subsequent cellular proliferation. The immune complexes are often composed of antibodies against streptococcal antigens in post-streptococcal glomerulonephritis or antinuclear antibodies in lupus nephritis.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify the type of glomerular deposits.
* **Option B:** This option is incorrect because it is too broad and does not accurately describe the specific condition associated with proliferative glomerular deposits.
* **Option C:** This option is incorrect because it is not directly related to the accumulation of immune complexes and cellular proliferation in the glomeruli.

**Clinical Pearl / High-Yield Fact**
The presence of proliferative glomerular deposits can be associated with various clinical manifestations, including hematuria, proteinuria, and renal insufficiency. A key feature of this condition is the presence of immune complexes, which can be detected using immunofluorescence microscopy.

**Correct Answer:** A. Membranoproliferative glomerulonephritis