The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Chronic mercury toxicity results from:   (A) Inhalation while removing old amalgam   (B) Skin contact   (C) Mercury vapour   (D) All of the above
['(D) All of the above <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Inhalation while removing old amalgam \n (B) Skin contact \n (C) Mercury vapour \n (D) All of the above <> possible answers', '  Chronic mercury toxicity results from: <> context@']