user: Question: What are the most wins in 1971 in 250cc class?
Columns: ['Year', 'Class', 'Team', 'Points', 'Rank', 'Wins']
Types: ['real', 'text', 'text', 'real', 'text', 'real']
Sample row: [1969.0, '125cc', 'Maico', 4.0, '40th', 0.0]
SQL:

assistant: SELECT MAX("Wins") FROM "Table" WHERE "Class" = '250cc' AND "Year" = 1971.0;