input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Km value indicates:   (A) Purity of Enzyme   (B) Physiological role   (C) The substrate concentration at half maximal velocity   (D) Aﬃnity
output: ['(C) The substrate concentration at half maximal velocity <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Purity of Enzyme  (B) Physiological role  (C) The substrate concentration at half maximal velocity  (D) Aﬃnity <> possible answers', '  Km value indicates: <> context']