**Core Concept**
The question tests the association between hepatitis B surface antigen (HbsAg) positivity and various renal conditions, highlighting the link between viral infections and kidney diseases. HbsAg positivity indicates an active hepatitis B infection, which can lead to immune complex deposition in the kidneys. This deposition can cause various glomerulopathies.

**Why the Correct Answer is Right**
HbsAg positivity is associated with membranous glomerulonephritis (MGN) due to the deposition of hepatitis B virus (HBV) antigens in the glomerular basement membrane, leading to immune complex formation and renal damage. Additionally, HBV infection can also be associated with membranoproliferative glomerulonephritis (MPGN), which is characterized by the deposition of immune complexes in the mesangium and subendothelial space.

**Why Each Wrong Option is Incorrect**
**Option B:** Minimal Change Disease (MCD) is not typically associated with HbsAg positivity, as it is more commonly related to allergic reactions or lymphoma.
**Option C:** Rapidly Progressive Glomerulonephritis (RPGN) can be caused by various factors, including anti-GBM disease or ANCA-associated vasculitis, but is not directly linked to HbsAg positivity.
**Option D:** Focal Segmental Glomerulosclerosis (FSGS) is a disease of the glomeruli characterized by sclerosis, but it is not typically associated with HbsAg positivity.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that hepatitis B infection can manifest with various extrahepatic manifestations, including renal involvement. Membranous glomerulonephritis and MPGN are notable associations with HbsAg positivity.

**Correct Answer: E. e) MPGN**