CREATE TABLE table_39775 ("Date" CLOB, "Cover model" CLOB, "Centerfold model" CLOB, "20 Questions" CLOB, "Pictorials" CLOB)

Which Centerfold model has a Cover model of irina voronina?
SELECT "Centerfold model" FROM table_39775 WHERE "Cover model" = 'irina voronina'
SELECT "Centerfold model" FROM "table_39775" WHERE "Cover model" = 'irina voronina'