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
Which of the following is a function of primary dentition 
Select and explain. 
A. Provide lip and cheek support, B. Helps in clear speech, C. Development of alveolar bone, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None