user: Question: What is the lowest crowd size at MCG?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Footscray', '8.6 (54)', 'Richmond', '10.17 (77)', 'Western Oval', 18000.0, '11 August 1928']
SQL:

assistant: SELECT MIN("Crowd") FROM "Table" WHERE "Venue" = 'MCG';