input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Greatest potential hazard of mercury toxicity occurs due to:   (A) Skin contact with mercury   (B) Inhalation of mercury vapours   (C) During amalgam restoration   (D) Ingestion of amalgam scrap during removal
output: ['(B) Inhalation of mercury vapours <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Skin contact with mercury  (B) Inhalation of mercury vapours  (C) During amalgam restoration  (D) Ingestion of amalgam scrap during removal <> possible answers', '  Greatest potential hazard of mercury toxicity occurs due to: <> context']