**Core Concept**
The World Health Organization (WHO) has recommended a standardized tool for the assessment of the severity of acute malnutrition in children. This tool is essential for the early detection of malnutrition and timely intervention to prevent complications.

**Why the Correct Answer is Right**
The WHO's recommended tool, STEPS, stands for Simplified Screening tool for malnutrition under 5 years. It is a user-friendly tool that assesses the weight-for-height, mid-upper arm circumference (MUAC), and the presence of visible severe wasting. STEPS is a crucial component of the Integrated Management of Acute Malnutrition (IMAM) program, which aims to improve the diagnosis and treatment of malnutrition in children.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because there is no widely recognized tool by the WHO with this name.
* **Option B:** This option is incorrect because the WHO's recommended tool is specifically designed for children under 5 years, not for all age groups.
* **Option C:** This option is incorrect because the WHO's recommended tool is not a comprehensive assessment tool that includes all aspects of malnutrition, but rather a simplified screening tool.

**Clinical Pearl / High-Yield Fact**
The STEPS tool is an essential component of the IMAM program and is widely used in low- and middle-income countries to detect and treat malnutrition in children.

**Correct Answer:** C. STEPS