input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** All of the following form radiolucent stones except:   (A) Xanthine   (B) Cysteine   (C) Allopurinol   (D) Orotic acid
output: ['(B) Cysteine <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Xanthine  (B) Cysteine  (C) Allopurinol  (D) Orotic acid <> possible answers', '  All of the following form radiolucent stones except: <> context']