user: Question: What nationality is Mark Eaton, Center position?
Columns: ['Player', 'Nationality', 'Position', 'Years for Jazz', 'School/Club Team']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Mark Eaton', 'United States', 'Center', '1982-94', 'UCLA']
SQL:

assistant: SELECT "Nationality" FROM "Table" WHERE "Position" = 'Center' AND "Player" = 'Mark Eaton';