Silvio Santos is the presenter in what country?
CREATE TABLE "table1_20780285_1" (
  "country_region" text,
  "title" text,
  "television_network" text,
  "winners" text,
  "presenters" text,
  "trainers" text
);
SELECT "country_region" FROM "table1_20780285_1" WHERE "presenters"='Silvio Santos';