Table schema:
CREATE TABLE table_27573848_18 (points_classification VARCHAR, general_classification VARCHAR, mountains_classification VARCHAR)

Question: If the mountains classification is Mathias Frank, and the General Classification is Fabian Cancellara, what is the Points classification?
SQL: SELECT points_classification FROM table_27573848_18 WHERE general_classification = "Fabian Cancellara" AND mountains_classification = "Mathias Frank"