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': 'Feature of a NiTi ﬁle that a surface project axially from the central core to the cutting edge between the ﬂutes is known as: \nSelect and explain. \nA. Taper, B. Land, C. Pitch, D. Rake angle', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Land:\nIt is the area between the flutes which projects axially from central core to the cutting edge.\nRake angle:\nIt is the angle formed by leading-edge with the radius of file. Acute angle is considered as a negative rake angle and obtuse angle is\xa0 considered as a positive rake angle.\nTaper:\nIt signifies per millimeter increase in file diameter from the tip towards handle of file.\nPitch:\nIt is the distance between two cutting edges. A file with short pitch has more flutes when compared to file with longer pitch.', 'role': 'assistant'}]