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
[{'content': 'Which of the following is a function of primary dentition \nSelect and explain. \nA. Provide lip and cheek support, B. Helps in clear speech, C. Development of alveolar bone, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]