user: Question: Name the highest Against on 21 November 1978?
Columns: ['Opposing Team', 'Against', 'Date', 'Venue', 'Status']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Cambridge University', 12.0, '18 October 1978', 'Grange Road, Cambridge', 'Tour Match']
SQL:

assistant: SELECT MAX("Against") FROM "Table" WHERE "Date" = '21 November 1978';