This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'WHO defines BMI of the malnourished as: March 2008 \nSelect and explain. \nA. Below 18 kg/m2, B. Below 18.5 kg/m2, C. Below 19 kg/m2, D. below 19.5 kg/m2', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Below 18.5 kg/m2 BMI is an estimate of total body fat mass and is probably the most useful scale to define obesity. Obesity has been defined as a BMI >30.0 kg/m2 in World Health Organization (WHO) classification Body mass index (BMI), calculated from measured weight and height, was classified using the World Health Organization categories of: Underweight (BMI < 18.5 kg/m2), Normal weight (BMI 18.5 to 24.9 kg/m2), Pre-obesity (PreOB = BMI 25 to 29.9 kg/m2) and Obesity (OB = BMI of more than 30 kg/m2)', 'role': 'assistant'}]