**Core Concept**
Focal segmental glomerulosclerosis (FSGS) and membranous nephropathy (MN) are types of glomerulonephritis that can lead to chronic kidney disease (CKD) and end-stage renal disease (ESRD). However, the likelihood of progression to chronic renal failure (CRF) varies among different types of glomerulonephritis.

**Why the Correct Answer is Right**
Membranoproliferative glomerulonephritis (MPGN) is a type of glomerulonephritis characterized by the deposition of immune complexes and complement activation, leading to the proliferation of mesangial cells and thickening of the glomerular basement membrane. MPGN is often associated with systemic diseases such as hepatitis C or systemic lupus erythematosus (SLE). While MPGN can cause CKD, it is less likely to progress to CRF compared to FSGS or MN, as it may respond to immunosuppressive therapy and plasmapheresis.

**Why Each Wrong Option is Incorrect**
**Option A:** FSGS is a common cause of CRF, as it leads to scarring and fibrosis of the glomeruli, resulting in permanent kidney damage.
**Option B:** MN is characterized by the thickening of the glomerular basement membrane due to immune complex deposition, leading to significant proteinuria and CKD progression.
**Option C:** MPGN, as mentioned, is less likely to cause CRF due to its potential responsiveness to immunosuppressive therapy and plasmapheresis.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the progression to CRF can be influenced by various factors, including the underlying cause of glomerulonephritis, the presence of systemic diseases, and the effectiveness of treatment.

**Correct Answer:** C. MPGN is the type of glomerulonephritis least likely to cause CRF.