<prompt> WHO defines BMI of the malnourished as: March 2008Below 18 kgm2Below 18.5 kgm2Below 19 kgm2below 19.5 kgm2  <response>: Ans. B: Below 18.5 kgm2 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 kgm2 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 kgm2, Normal weight BMI 18.5 to 24.9 kgm2, Pre-obesity PreOB BMI 25 to 29.9 kgm2 and Obesity OB BMI of more than 30 kgm2 