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: Medicine
Normal body mass index is between 
Select and explain. 
A. 16.5 - 20.5, B. 18.5 - 24.9, C. 25.0 - 29.9, D. 30.0 - 39.9
B: 18.5 - 24.9
Answer: B: 18.5 - 24.9 
Explanation: None