user: Question: What is the nationality of the player who played for the Peterborough Petes (OHL)?
Columns: ['Round', 'Player', 'Nationality', 'NHL team', 'College/junior/club team (league)']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Libor Polasek (C)', 'Czechoslovakia', 'Vancouver Canucks', 'Vitkovice SSK ( CSFR )']
SQL:

assistant: SELECT "Nationality" FROM "Table" WHERE "College/junior/club team (league)" = 'Peterborough Petes (OHL)';