CREATE TABLE table_27757 ("Stage" FLOAT, "Winner" TEXT, "General classification" TEXT, "Points classification" TEXT, "Mountains classification" TEXT, "Combination Classification" TEXT, "Team classification" TEXT)

Who was awarded mountains classifications when Mikel Nieve was the winner?
SELECT "Mountains classification" FROM table_27757 WHERE "Winner" = 'Mikel Nieve'
SELECT "Mountains classification" FROM "table_27757" WHERE "Winner" = 'Mikel Nieve'