user: Question: WHAT COUNTRY HAS A PLAYER NAMED Jack Nicklaus?
Columns: ['Player', 'Country', 'Year(s) won', 'Total', 'To par', 'Finish']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Mark Calcavecchia', 'United States', '1989', 282.0, '–2', 'T10']
SQL:

assistant: SELECT "Country" FROM "Table" WHERE "Player" = 'Jack Nicklaus';