user: Question: Who is the away team at the game at MCG with the crowd is larger than 15500?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['North Melbourne', '14.15 (99)', 'St Kilda', '10.11 (71)', 'Arden Street Oval', 12000.0, '31 May 1930']
SQL:

assistant: SELECT "Away team" FROM "Table" WHERE "Crowd" > 15500.0 AND "Venue" = 'MCG';