user: Question: What is Opponent, when Week is "5"?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 20, 1970', 'Denver Broncos', 'L 25–10', 34882.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Week" = 5.0;