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': 'Rotational changes in the mandible essentially consist of \nSelect and explain. \nA. Matrix rotation 25% and Intramatrix rotation 75%, B. Matrix rotation 50% and Intramatrix rotation 50%, C. Matrix rotation 100% and Intramatrix rotation 0%, D. Matrix rotation 0% and Intramatrix rotation 100%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]