user: Question: Which nation is Robert Gesink from?
Columns: ['Cyclist', 'Nation', 'Team', 'Time', 'UCI Points']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['Johan Vansummeren', 'Belgium', 'PRL', '30h 52\' 11"', 50.0]
SQL:

assistant: SELECT "Nation" FROM "Table" WHERE "Cyclist" = 'Robert Gesink';