input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** In excitable cells, repolarization is closely associated with one of the following events:   (A) Na+ efflux   (B) Na+ influx   (C) K+ efflux   (D) K+ influx
output: ['(C) K+ efflux <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Na+ efflux  (B) Na+ influx  (C) K+ efflux  (D) K+ influx <> possible answers', '  In excitable cells, repolarization is closely associated with one of the following events: <> context']