input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Phenylbutyrate is used in management of urea cycle disorders. What is its role?   (A) Activates enzymes of urea cycle   (B) Excretion of products of urea cycle   (C) Maintains energy production   (D) Scavenges nitrogen
output: ['(D) Scavenges nitrogen <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Activates enzymes of urea cycle  (B) Excretion of products of urea cycle  (C) Maintains energy production  (D) Scavenges nitrogen <> possible answers', '  Phenylbutyrate is used in management of urea cycle disorders. What is its role? <> context']