user: Question: Who was the away team that played Fitzroy on May 13, 1950 at Brunswick Street Oval.
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Fitzroy', '16.27 (123)', 'South Melbourne', '8.9 (57)', 'Brunswick Street Oval', 12500.0, '13 May 1950']
SQL:

assistant: SELECT "Away team" FROM "Table" WHERE "Venue" = 'Brunswick Street Oval';