## **Core Concept**
The Body Mass Index (BMI) is a widely used tool to categorize individuals into various weight categories, including underweight, normal weight, overweight, and obesity. BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters (kg/m^2). The World Health Organization (WHO) has defined specific BMI ranges for these categories.

## **Why the Correct Answer is Right**
The correct answer, , corresponds to the BMI range defined by the World Health Organization (WHO) for obesity. According to the WHO, an individual is considered obese if their BMI is 30 or higher. This categorization is crucial for assessing the risk of various health conditions associated with obesity, such as diabetes mellitus, hypertension, and cardiovascular diseases.

## **Why Each Wrong Option is Incorrect**
* **Option A:** - This range corresponds to underweight or normal weight according to the WHO classifications (underweight: <18.5, normal weight: 18.5-24.9). * **Option B:** - This range is classified as overweight (25-29.9). * **Option D:** - This option does not correspond to any recognized BMI category related to obesity. ## **Clinical Pearl / High-Yield Fact** A key clinical pearl is that BMI is not a perfect measure, as it does not differentiate between lean body mass and body fat. However, it remains a useful screening tool for assessing weight-related health risks. For example, individuals with a high muscle mass might have a high BMI without being overfat. ## **Correct Answer:** . ≥ 30.