The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Enzymes are classified according to:   (A) Action on substrate   (B) Action of coenzymes   (C) Nature of the enzymes   (D) All of the above
['(A) Action on substrate <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Action on substrate \n (B) Action of coenzymes \n (C) Nature of the enzymes \n (D) All of the above <> possible answers', '  Enzymes are classified according to: <> context@']