## **Core Concept**
Lipoid nephrosis, also known as minimal change disease, is a type of kidney disease characterized by the loss of large amounts of protein in the urine. It is a common cause of nephrotic syndrome, especially in children. The disease is named for its appearance under light microscopy, which appears normal or nearly normal.

## **Why the Correct Answer is Right**
The correct answer includes features that are characteristic of lipoid nephrosis or minimal change disease.
- **Normal on light microscopy (a)**: This is a hallmark of minimal change disease. The glomeruli appear normal or nearly normal under light microscopy.
- **Diffuse, uniform effacement of foot processes (d)**: This is a characteristic finding under electron microscopy, where the foot processes of the podocytes are diffusely and uniformly effaced.

## **Why Each Wrong Option is Incorrect**
- **Option B: Epithelial deposit**: Minimal change disease is characterized by the absence of immune deposits on immunofluorescence and electron microscopy, making this option incorrect.
- **Option C: Glomerular tuft sclerosis**: This is more characteristic of focal segmental glomerulosclerosis (FSGS), a different type of kidney disease.
- **Option E: Tubular sclerosis**: This feature is not characteristic of minimal change disease and can be seen in other conditions such as tubulointerstitial diseases.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that minimal change disease is highly responsive to corticosteroids, with most patients going into remission within 8-16 weeks of starting treatment. This responsiveness is a diagnostic clue and a therapeutic hallmark.

## **Correct Answer:** D. a, d