user: Question: Attendance of 55,340 had what opponent?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Record', 'Game Site', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'August 31, 1997', 'at Miami Dolphins', 'L 10–16', '0–1', 'Pro Player Stadium', '70,813']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Attendance" = '55,340';