user: Question: Which nationality has Left Wing as the position and college/junior/team is Portland Winterhawks (WHL)?
Columns: ['Pick', 'Player', 'Position', 'Nationality', 'NHL team', 'College/junior/club team']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['53.', 'Brad Larsen', 'Left Wing', 'Canada', 'Ottawa Senators', 'Swift Current Broncos (WHL)']
SQL:

assistant: SELECT "Nationality" FROM "Table" WHERE "Position" = 'Left Wing' AND "College/junior/club team" = 'Portland Winterhawks (WHL)';