user: Question: Which Manufacturer has a Laps of 21, a Grid larger than 16, and a Rider of Akira Ryō?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Max Biaggi', 'Yamaha', 21.0, '44:01.592', 2.0]
SQL:

assistant: SELECT "Manufacturer" FROM "Table" WHERE "Laps" = 21.0 AND "Grid" > 16.0 AND "Rider" = 'Akira Ryō';