Ans. is 'b' i.e., 2 SD from median weight for height Obesity Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have an adverse effect on health, leading to reduced life expectancy. Body mass index (BMI) is used to define obesity. BMI define a person overweight when his BMI is between 25 - 30 kg/m2 and obese when his BMI is greater than 30 kg/m2. Body weight, though not an accurate measure of excess fat, is a widely used index. In epidemiological studies it is conventional to accept +2SD (standard detions) from the median weight for height as a cut-of fpoint for obesity.