user: Question: Who is Winning driver on 18 May?
Columns: ['Name', 'Circuit', 'Date', 'Winning driver', 'Winning constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Targa Florio', 'Madonie', '18 May', 'Vincenzo Trucco', 'Isotta-Fraschini', 'Report']
SQL:

assistant: SELECT "Winning driver" FROM "Table" WHERE "Date" = '18 May';