user: Question: Silvio Santos is the presenter in what country?
Columns: ['Country/Region', 'Title', 'Television network', 'Winners', 'Presenters', 'Trainers']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Brazil', 'O Grande Perdedor The Big Loser', 'SBT', 'Season 1, 2005: Andreia Dutra', 'Silvio Santos', 'Unknown']
SQL:

assistant: SELECT "Country/Region" FROM "Table" WHERE "Presenters" = 'Silvio Santos';