user: Question: What was the lowest ranking rower from Great Britain?
Columns: ['Rank', 'Rowers', 'Country', 'Time', 'Notes']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Matthew Wells , Stephen Rowbotham', 'Great Britain', '6:26.33', 'SA/B']
SQL:

assistant: SELECT MIN("Rank") FROM "Table" WHERE "Country" = 'Great Britain';