**Core Concept**
Marasmus is a form of severe malnutrition characterized by profound loss of body mass due to inadequate caloric intake, leading to depletion of fat and muscle stores. It differs from kwashiorkor in that it lacks protein deficiency, and its clinical features reflect starvation rather than protein-energy imbalance.

**Why the Correct Answer is Right**
In marasmus, there is severe caloric deficiency, resulting in loss of fat and muscle. Edema is not seen because it is a hallmark of kwashiorkor, which results from protein deficiency and imbalanced nutrition. Marasmus presents with dry, wrinkled skin, extreme wasting, and reduced activity. The absence of edema is due to the lack of plasma protein depletion and fluid retention. Hepatomegaly is typically absent, and the child is often active despite weakness, reflecting a lack of energy reserves.

**Why Each Wrong Option is Incorrect**
Option B: Voracious appetite is not seen in marasmus; patients typically have a decreased appetite due to starvation. This makes "voracious appetite" incorrect as a feature.
Option C: Hepatomegaly is not seen in marasmus, which is correct — this is a key differentiator from kwashiorkor where hepatomegaly is common.
Option D: The child may appear active due to low energy reserves, but this is not a defining feature. Still, "active" is a plausible observation, so it is not the best choice to exclude.

**Clinical Pearl / High-Yield Fact**
In marasmus, **edema is absent**, and the child appears wasted with dry skin and reduced activity. Always remember: **"No edema = marasmus; edema = kwashiorkor"** — this is a key diagnostic clue in pediatric malnutrition.

✓ Correct Answer: A. Edema