Which of the following best describes class III obesity according to the World Health Organization (WHO)?

Class III obesity, often referred to as "morbid obesity," is defined by the World Health Organization (WHO) as having a Body Mass Index (BMI) of 40 or above. This classification signifies a significantly increased risk of various health complications, including heart disease, diabetes, and other serious conditions. Individuals with a BMI in this range generally require comprehensive medical interventions, lifestyle changes, or even surgical options to manage their weight effectively.

The other choices represent different categories of obesity and overweight. For instance, a BMI of 25 to 30 indicates overweight, while BMI ranges of 30 to 35 and 35 to 40 correspond to class I and class II obesity, respectively. Therefore, the correct characterization of class III obesity aligns solely with the BMI measurement of over 40, emphasizing the severity of health risks associated with this level of obesity.