**Core Concept**
Hepatitis C virus (HCV) infection can lead to various extrahepatic manifestations, including renal complications. One such complication is membranoproliferative glomerulonephritis (MPGN), characterized by the deposition of immune complexes and complement activation, resulting in damage to the glomerular basement membrane.

**Why the Correct Answer is Right**
In this patient with Hepatitis C, the presence of hypo-complementemia, proteinuria, and hematuria suggests an immune-mediated process. MPGN is a well-known complication of HCV infection, where the virus triggers the production of anti-HCV antibodies, which form immune complexes and deposit in the glomeruli, leading to complement activation and subsequent renal damage. The 2 gm/day proteinuria and hematuria further support the diagnosis of MPGN, as these findings are characteristic of glomerular injury.

**Why Each Wrong Option is Incorrect**
**Option A:** While post-infectious glomerulonephritis (D) can also present with similar symptoms, it typically follows a streptococcal infection and is less commonly associated with HCV. Moreover, the presence of hypo-complementemia and the chronic nature of the patient's condition make MPGN a more likely diagnosis.

**Option B:** Cryoglobulinemia is another complication of HCV infection, characterized by the presence of cryoglobulins in the blood. However, it typically presents with symptoms such as vasculitis, skin lesions, and arthralgias, rather than renal manifestations.

**Option C:** Membranous glomerulopathy is a condition characterized by the deposition of immune complexes on the subepithelial side of the glomerular basement membrane. While it can present with proteinuria, it is less commonly associated with HCV infection and typically presents with nephrotic syndrome rather than hematuria.

**Option D:** Post-infectious glomerulonephritis typically follows a streptococcal infection and is characterized by the presence of anti-streptolysin O antibodies. It is less commonly associated with HCV infection and typically presents with a more acute onset of symptoms.

**Clinical Pearl / High-Yield Fact**
MPGN is a well-known complication of HCV infection, and its diagnosis is often supported by the presence of hypo-complementemia and renal biopsy findings. It is essential to consider MPGN in the differential diagnosis of patients with HCV who present with renal manifestations.

**✓ Correct Answer: A. MPGN**