user: Question: What was the highest crowd at the venue 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: ['Melbourne', '8.13 (61)', 'North Melbourne', '20.17 (137)', 'MCG', 21268.0, '20 May 1978']
SQL:

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