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': 'In which of the brushing techniques, the bristles are placed at 45 degree angulation facing the occlusal surfaces of teeth? \nSelect and explain. \nA. Modified bass technique, B. Bass technique, C. Fones technique, D. Charters technique', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]