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': 'Most detrimental methods of brusing causing damage to tooth soft tissues and hard tissues is: \nSelect and explain. \nA. Side to side, B. Bass, C. Up and down, D. Roll', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]