The following are multiple choice questions (with answers) about medical knowledge.   **Question:** All of these stains are used in tattooing except:   (A) Osmium blue   (B) Prussian blue   (C) Vermillion   (D) India ink
['(A) Osmium blue <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Osmium blue \n (B) Prussian blue \n (C) Vermillion \n (D) India ink <> possible answers', '  All of these stains are used in tattooing except: <> context@']