This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NCDs: CHD, HTN, DM, RF, Cancers, Obesity, Blindness, Subject name: Social & Preventive Medicine
[{'content': 'Percentile BMI for defining as Underweight is:- \nSelect and explain. \nA. <5th percentile, B. <50th percentile, C. <85th percentile, D. <95th percentile', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Percentile classification of obesity: Underweight: less than 5th percentile Normal BMI: 5th - 85th percentile Overweight: 85th - 95th percentile Obesity: > 95th percentile.', 'role': 'assistant'}]