user: Question: What is the nationality of the Guard who plays at Utah?
Columns: ['Player', 'Nationality', 'Position', 'Years for Jazz', 'School/Club Team']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Mark Jackson', 'United States', 'Point guard', '2002-03', "St. John's"]
SQL:

assistant: SELECT "Nationality" FROM "Table" WHERE "Position" = 'Guard' AND "School/Club Team" = 'Utah';