The following are multiple choice questions (with answers) about medical knowledge.   **Question:** When horse serum is injected intravenously in to a rabbit and again in to the skin two or three weeks later, what is the necrotising reaction that occurs at the site of the second injection?   (A) Atopy   (B) Anaphylaxis   (C) Arthus phenomenon   (D) Serum sickness
['(C) Arthus phenomenon <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Atopy \n (B) Anaphylaxis \n (C) Arthus phenomenon \n (D) Serum sickness <> possible answers', '  When horse serum is injected intravenously in to a rabbit and again in to the skin two or three weeks later, what is the necrotising reaction that occurs at the site of the second injection? <> context@']