What is the report for a 250 cc of sito pons, and a 500 cc of wayne gardner?
CREATE TABLE "winners_of_the_yugoslavian_motorcycle_gr" (
  "year" real,
  "track" text,
  "250_cc" text,
  "500_cc" text,
  "report" text
);
SELECT "report" FROM "winners_of_the_yugoslavian_motorcycle_gr" WHERE "250_cc"='sito pons' AND "500_cc"='wayne gardner';