user: Question: Who won on May 2011?
Columns: ['Series', 'Date', 'Entrants', 'Winner', 'First Prize']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['FTOPS I', 'August 2006', 1468.0, 'Crownnginger', '$161,480']
SQL:

assistant: SELECT "Winner" FROM "Table" WHERE "Date" = 'May 2011';