user: Question: Name the motogp winner for 6 May
Columns: ['Round', 'Date', 'Grand Prix', 'Circuit', 'MotoGP winner', 'Moto2 winner', 'Moto3 winner', 'Report']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '8 April', 'Commercialbank Grand Prix of Qatar', 'Losail', 'Jorge Lorenzo', 'Marc Márquez', 'Maverick Viñales', 'Report']
SQL:

assistant: SELECT "MotoGP winner" FROM "Table" WHERE "Date" = '6 May';