## 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 name "minimal change" refers to the fact that the kidney tissue appears almost normal under light microscopy.

## Why the Correct Answer is Right
The correct answer, , implies that minimal change disease is characterized by the absence of significant changes on light microscopy, but electron microscopy shows podocyte foot process effacement. This is a hallmark of MCD. The disease is highly responsive to corticosteroids, which makes it a distinctive feature of MCD.

## Why Each Wrong Option is Incorrect
* **Option A:** This option might suggest a specific treatment or characteristic not unique or universally applicable to MCD, making it incorrect without further context.
* **Option B:** This could imply a different pathological feature or a different disease entity altogether, not aligning with the typical presentation of MCD.
* **Option D:** This might suggest a complication or an association not specifically characteristic of 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. This is a crucial distinguishing feature from other causes of nephrotic syndrome.

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