CREATE TABLE table_5999 ("Stage" CLOB, "Winner" CLOB, "General classification" CLOB, "Points classification" CLOB, "Mountains classification" CLOB, "Combination classification" CLOB, "Team classification" CLOB)

Which Mountains classification has a Team classification of quick step?
SELECT "Mountains classification" FROM table_5999 WHERE "Team classification" = 'quick step'
SELECT "Mountains classification" FROM "table_5999" WHERE "Team classification" = 'quick step'