Table schema:
CREATE TABLE table_name_18 (sprints_classification VARCHAR, points_classification VARCHAR, team_classification VARCHAR)

Question: What Sprints classification has the Points classification, Mark Cavendish and Team classification, Caisse D'epargne?
SQL: SELECT sprints_classification FROM table_name_18 WHERE points_classification = "mark cavendish" AND team_classification = "caisse d'epargne"