user: Question: Which Opponents have a Score of 1–2, and a Team of Arsenal, and Progress of First round?
Columns: ['Year', 'Team', 'Progress', 'Score', 'Opponents']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1955–58', 'Birmingham City', 'Semi-finals', '1–2 (Playoff)', 'Barcelona']
SQL:

assistant: SELECT "Opponents" FROM "Table" WHERE "Score" = '1–2' AND "Team" = 'Arsenal' AND "Progress" = 'First round';