Who won the XXIV Gran Premio di Pescara in the sports car class?
CREATE TABLE "race_winners" (
  "year" text,
  "driver_s" text,
  "class" text,
  "vehicle" text,
  "race_title" text
);
SELECT "driver_s" FROM "race_winners" WHERE "class"='sports car' AND "race_title"='xxiv gran premio di pescara';