The following are multiple choice questions (with answers) about medical knowledge.   **Question:** All of the following influence the efficiency of bur, except:   (A) Neck diameter   (B) Length and diameter of bur   (C) Height of taper of bur   (D) Spiral angle and cross-cuts of bur
['(C) Height of taper of bur <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Neck diameter \n (B) Length and diameter of bur \n (C) Height of taper of bur \n (D) Spiral angle and cross-cuts of bur <> possible answers', '  All of the following influence the efficiency of bur, except: <> context@']