**Core Concept**
The World Health Organization (WHO) classification of malnutrition is a widely accepted system for categorizing malnutrition in children and adults. This classification takes into account various parameters to assess the severity and type of malnutrition.

**Why the Correct Answer is Right**
The WHO classification of malnutrition includes several key parameters such as weight-for-height, height-for-age, weight-for-age, and mid-upper arm circumference (MUAC). These parameters help in the early detection and management of malnutrition. The correct answer is not a parameter used in the WHO classification of malnutrition.

**Why Each Wrong Option is Incorrect**
**Option A:** Weight-for-height is a parameter used in the WHO classification of malnutrition. It helps in assessing the severity of acute malnutrition.
**Option B:** Height-for-age is also a parameter used in the WHO classification of malnutrition. It helps in assessing the severity of stunting.
**Option C:** Mid-upper arm circumference (MUAC) is a parameter used in the WHO classification of malnutrition, especially in children under 5 years of age. It helps in assessing the severity of acute malnutrition.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the WHO classification of malnutrition is widely used in clinical and public health settings to assess and manage malnutrition. The classification helps in identifying the type and severity of malnutrition, which guides the treatment and management plan.

**Correct Answer:** D.