user: Question: What was the audience for Episode 21?
Columns: ['Episode', 'Title', 'Date of emission', 'Audience', 'Share']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['FIRST SEASON', 'FIRST SEASON', 'FIRST SEASON', 'FIRST SEASON', 'FIRST SEASON']
SQL:

assistant: SELECT "Audience" FROM "Table" WHERE "Episode" = '21';