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': 'Normal range of BMI is: \nSelect and explain. \nA. 25-29.99, B. 18.5-24.99, C. 18.5-29.99, D. 30-34.99', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 18.5-24.99', 'role': 'assistant'}]