This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'On the basis of BMI obesity is labeled at \nSelect and explain. \nA. 20, B. 25, C. 30, D. 18', 'role': 'user'}, {'content': "Answer: C \nExplanation: Body mass index (BMI) or Quetelet index:Defined as the body mass divided by the square of the body height, and is expressed in units of kg/m2BMIWeight status< 18.5 Underweight18.5-24.9 Healthy25.0-29.9Overweight>= 30.0Obese30.00-34.99 Obese class I35.00-39.99 Obese class II>= 40 Obese class IIIRef: Harrison's 18/e p608, 622, 630", 'role': 'assistant'}]