user: Question: What is Opponent, when Result is Loss, and when Venue is Mosaic Stadium?
Columns: ['Week', 'Date', 'Opponent', 'Venue', 'Score', 'Result', 'Attendance', 'Record']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'June 26', 'at Hamilton Tiger-Cats', 'Ivor Wynne Stadium', '33–10', 'Win', '20,589', '1–0']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Result" = 'Loss' AND "Venue" = 'Mosaic Stadium';