user: Question: Who is the winner where the losing hand is Ah 7s?
Columns: ['Year', 'Winner', 'Winning Hand', 'Prize Money', 'Entrants', 'Runner-Up', 'Losing Hand']
Types: ['real', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: [2007.0, 'Annette Obrestad', '7h 7s', '£1,000,000', 362.0, 'John Tabatabai', '5s 6d']
SQL:

assistant: SELECT "Winner" FROM "Table" WHERE "Losing Hand" = 'Ah 7s';