**Core Concept**
Malnutrition encompasses a range of nutritional deficiencies that can manifest as either acute or chronic conditions. Both forms of malnutrition result from an imbalance between nutrient intake and the body's requirements, leading to alterations in growth, development, and overall health.

**Why the Correct Answer is Right**
The correct answer is related to the concept of muscle wasting, which is a common feature of both acute and chronic malnutrition. Muscle wasting is characterized by the breakdown of skeletal muscle mass, leading to weakness, fatigue, and impaired physical function. This occurs due to the depletion of muscle proteins, such as actin and myosin, which are essential for muscle contraction and relaxation. In both acute and chronic malnutrition, the body's energy reserves are depleted, leading to the breakdown of muscle tissue to meet energy demands.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a common feature of both acute and chronic malnutrition. While both forms of malnutrition can lead to weight loss, it is a more prominent feature of acute malnutrition.
**Option B:** This option is incorrect because it is more commonly associated with chronic malnutrition. While chronic malnutrition can lead to stunted growth, it is not a common feature of acute malnutrition.
**Option C:** This option is incorrect because it is not a direct consequence of malnutrition. While skin lesions can be a feature of certain nutritional deficiencies, they are not a common feature of both acute and chronic malnutrition.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of malnutrition is muscle wasting, which can be assessed by measuring mid-upper arm circumference (MUAC) or arm muscle circumference. These measurements can help identify individuals at risk of malnutrition and guide targeted interventions.

**Correct Answer: C. Muscle wasting.**