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
The main reason for replacing premature loss of primary anterior teeth 
Select and explain. 
A. Form and function, B. Speech and esthetics, C. Space maintenance, D. None of the above
B: Speech and esthetics
Answer: B: Speech and esthetics 
Explanation: None