user: Question: Who was the away captain at WACA Ground?
Columns: ['Date', 'Home captain', 'Away captain', 'Venue', 'Result']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['29,30 November, 1,2 December 1991', 'Allan Border', 'Mohammad Azharuddin', 'Brisbane Cricket Ground', 'AUS by 10 wkts']
SQL:

assistant: SELECT "Away captain" FROM "Table" WHERE "Venue" = 'WACA Ground';