CREATE TABLE table_30585 ("Stage" FLOAT, "Winner" CLOB, "General classification" CLOB, "Points classification" CLOB, "Mountains classification" CLOB, "Young rider classification" CLOB)

When Alberto Contador Kanstantsin Sivtsov was the general classification and Alessandro Petacchi was the points classification at the same time while Mark Cavendish is the winner, who was the mountain classification?
SELECT "Mountains classification" FROM table_30585 WHERE "General classification" = 'Alberto Contador Kanstantsin Sivtsov' AND "Points classification" = 'Alessandro Petacchi' AND "Winner" = 'Mark Cavendish'
SELECT "Mountains classification" FROM "table_30585" WHERE "General classification" = 'Alberto Contador Kanstantsin Sivtsov' AND "Points classification" = 'Alessandro Petacchi' AND "Winner" = 'Mark Cavendish'