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': 'Proxa brushes are recommended to be used in \nSelect and explain. \nA. Type I embrasure, B. Type II embrasure, C. Type III embrasure, D. Any of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]