user: Question: Who was the opponent when the attendance was 31,002?
Columns: ['Date', 'Opponent', 'Site', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['September 5', 'at Virginia Tech', 'Lane Stadium • Blacksburg, VA', 'L3–38', '48,134']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Attendance" = '31,002';