user: Question: What sport did the National team play in the 1968 Mexico City Games?
Columns: ['Medal', 'Name', 'Games', 'Sport', 'Event']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Silver', 'National team', '1956 Melbourne', 'Field hockey', "Men's competition"]
SQL:

assistant: SELECT "Sport" FROM "Table" WHERE "Name" = 'National team' AND "Games" = '1968 Mexico City';