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': 'Balanced force technique is used for tooth preparation: \nSelect and explain. \nA. Lateral force is used during preparation, B. Apical force is used during preparation, C. No force is used, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]