user: Question: Who did the Browns play week 12?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 1, 1991', 'Dallas Cowboys', 'L 26–14', 78860.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Week" = 12.0;