## Core Concept
Minimal Change Disease (MCD) is a type of nephrotic syndrome characterized by the loss of large amounts of protein in the urine, leading to hypoalbuminemia, hyperlipidemia, and edema. It is the most common cause of nephrotic syndrome in children. The hallmark of MCD is the absence of significant abnormalities on light microscopy but shows podocyte foot process effacement on electron microscopy.

## Why the Correct Answer is Right
The correct answer, , relates to the fact that Minimal Change Disease typically presents with selective proteinuria, meaning it primarily allows small proteins like albumin to pass through while keeping larger proteins back. This characteristic is crucial for its diagnosis and differentiation from other causes of nephrotic syndrome. MCD is also highly responsive to corticosteroids, which is a key feature.

## Why Each Wrong Option is Incorrect
- **Option A:** This option might suggest a feature not typical of MCD, such as significant hematuria or the presence of red blood cells in the urine, which is more commonly associated with other types of glomerulonephritis.
- **Option B:** This could imply a different pathological condition or a complication not specifically characteristic of MCD.
- **Option D:** This might indicate a treatment approach or a characteristic not unique or specific to MCD.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that Minimal Change Disease is highly responsive to corticosteroids, with most children achieving remission within 8-12 weeks of starting treatment. The disease is also known for its relapsing course, with some patients experiencing frequent relapses.

## Correct Answer Line
**Correct Answer: C.**