user: Question: What is the away team that had a score of 15.9 (99)?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Richmond', '15.20 (110)', 'South Melbourne', '7.10 (52)', 'Punt Road Oval', 20000.0, '7 May 1955']
SQL:

assistant: SELECT "Away team" FROM "Table" WHERE "Away team score" = '15.9 (99)';