user: Question: What driver has grid number 18?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Juan Pablo Montoya', 'Williams - BMW', 71.0, '1:28:01.451', 2.0]
SQL:

assistant: SELECT "Driver" FROM "Table" WHERE "Grid" = 18.0;