user: Question: Who is the home team when Sheffield United is the away team?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Blackpool', '2–1', 'Stockport County', '27 January 1951']
SQL:

assistant: SELECT "Home team" FROM "Table" WHERE "Away team" = 'Sheffield United';