user: Question: Which week had a result of L 38-21?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 9, 1990', 'Tampa Bay Buccaneers', 'L 38-21', '56,692']
SQL:

assistant: SELECT "Week" FROM "Table" WHERE "Result" = 'L 38-21';