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': 'ADA number 33½ stands for which bur design? \nSelect and explain. \nA. Round, B. Inverted cone, C. Tapered fissure, D. Pear', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Names and Key Dimensions of Recommended Burs', 'role': 'assistant'}]