The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Rake angle for tungsten carbide burs:   (A) Positive.   (B) Neutral.   (C) Slight negative.   (D) Both BC
['(D) Both BC <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Positive. \n (B) Neutral. \n (C) Slight negative. \n (D) Both BC <> possible answers', '  Rake angle for tungsten carbide burs: <> context@']