**Core Concept**
Steroid resistance in the context of nephrology refers to the phenomenon where patients with certain kidney diseases fail to respond to steroid therapy, making it challenging to manage their condition. This resistance is often seen in conditions like minimal change disease, focal segmental glomerulosclerosis (FSGS), and membranous nephropathy, among others. The underlying mechanism involves impaired steroid-induced transcriptional regulation, leading to reduced expression of genes involved in kidney function.

**Why the Correct Answer is Right**
The correct answer is membranous nephropathy, as it is one of the few conditions where steroid resistance is less common. Membranous nephropathy is characterized by the deposition of immune complexes on the subepithelial side of the glomerular basement membrane, leading to proteinuria. In contrast to other steroid-resistant conditions, membranous nephropathy often responds well to immunosuppressive therapy, including steroids, although some cases may require additional treatment.

**Why Each Wrong Option is Incorrect**
**Option A:** Minimal change disease is a classic example of a steroid-resistant nephrotic syndrome, where patients often require prolonged or even lifelong immunosuppressive therapy to control proteinuria.
**Option B:** Focal segmental glomerulosclerosis (FSGS) is another condition where steroid resistance is common, particularly in the non-diabetic form. FSGS is characterized by the scarring of glomeruli, leading to proteinuria and kidney dysfunction.
**Option C:** IgA nephropathy, also known as Berger's disease, is a steroid-resistant condition where patients often require immunosuppressive therapy to control proteinuria and prevent kidney damage.

**Clinical Pearl / High-Yield Fact**
A key clinical correlation to remember is that patients with steroid-resistant nephrotic syndrome often require long-term immunosuppressive therapy to control proteinuria and prevent kidney damage. It is essential to monitor kidney function and adjust treatment accordingly to prevent progression to end-stage renal disease.

**Correct Answer: D. Membranous nephropathy.**