The following are multiple choice questions (with answers) about medical knowledge.   **Question:** All are true about metformin except:   (A) Inhibits cellular respiration in mitochondria   (B) Excreted unchanged in urine   (C) Reduce hepatic glucose production   (D) Used in decompensated heart failure
['(D) Used in decompensated heart failure <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Inhibits cellular respiration in mitochondria \n (B) Excreted unchanged in urine \n (C) Reduce hepatic glucose production \n (D) Used in decompensated heart failure <> possible answers', '  All are true about metformin except: <> context@']