The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Black foot is seen in which poisoning?   (A) Arsenic   (B) Lead   (C) Mercury   (D) Phosphorus
['(A) Arsenic <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Arsenic \n (B) Lead \n (C) Mercury \n (D) Phosphorus <> possible answers', '  Black foot is seen in which poisoning? <> context@']