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
Christmas Tree profile variation is attributed to the following head shape of a diamond abrasive instrument 
Select and explain. 
A. Flame, B. Needle, C. Interproximal, D. Taper
B: Needle
Answer: B: Needle 
Explanation: None