What is the Nationality when the club team is Peterborough Petes (OHL)?
CREATE TABLE "2011_draft_picks" (
  "round" real,
  "overall" text,
  "player" text,
  "position" text,
  "nationality" text,
  "club_team" text
);
SELECT "nationality" FROM "2011_draft_picks" WHERE "club_team"='Peterborough Petes (OHL)';