user: Question: In Week 13, who was the opponent?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 15, 1974', 'at Houston Oilers', 'L 21–14', 25317.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Week" = 13.0;