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': 'Average duration of function of primary dentition \nSelect and explain. \nA. 6 years, B. 8 years, C. 10 years, D. 12 years', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Average duration of function of primary dentition is 6 yrs while maximum duration is 10 years.', 'role': 'assistant'}]