CREATE TABLE table_37239 ("Round" FLOAT, "Date" TEXT, "Grand Prix" TEXT, "Circuit" TEXT, "125cc winner" TEXT, "250cc winner" TEXT, "MotoGP winner" TEXT, "Report" TEXT)

Which 250cc winner has a 125cc winner of bradley smith, and a Circuit of mugello?
SELECT "250cc winner" FROM table_37239 WHERE "125cc winner" = 'bradley smith' AND "Circuit" = 'mugello'
SELECT "250cc winner" FROM "table_37239" WHERE "125cc winner" = 'bradley smith' AND "Circuit" = 'mugello'