user: Question: How many attendances had the Detroit Lions as opponents?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Record', 'Game Site', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 17, 1967', 'Atlanta Falcons', 'W 38–31', '1–0', 'Memorial Stadium', 56715.0]
SQL:

assistant: SELECT COUNT("Attendance") FROM "Table" WHERE "Opponent" = 'Detroit Lions';