The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Pre-carve burnishing is useful for all except:   (A) Bring further excess mercury to surface   (B) Increase surface hardness   (C) Decrease number and size of voids   (D) Marginal adaptation
['(B) Increase surface hardness <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Bring further excess mercury to surface \n (B) Increase surface hardness \n (C) Decrease number and size of voids \n (D) Marginal adaptation <> possible answers', '  Pre-carve burnishing is useful for all except: <> context@']