user: Question: Who was the opponent at the game when the record was 71-78?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['September 1', '@ Mets', '3 - 0', 'Hentgen (14-9)', 19196.0, '65-71']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Record" = '71-78';