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': 'Inorganic content of cementum is \nSelect and explain. \nA. 45 to 50%, B. 50 to 55%, C. 55 to 60%, D. 60 to 65%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]