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: Dental
BMI to classify obesity should be ? 
Select and explain. 
A. ≥20, B. ≥30, C. ≥40, D. ≥50
B: ≥30
Answer: B: ≥30 
Explanation: None