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': 'Christmas Tree profile variation is attributed to the following head shape of a diamond abrasive instrument \nSelect and explain. \nA. Flame, B. Needle, C. Interproximal, D. Taper', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]