user: Question: what's runner-up with season being Season 13
Columns: ['Season', 'Airdate', 'The Mole', 'Winner', 'Runner-up', 'Prize money', 'International destination']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Season 1', '19 November 1999', 'Deborah', 'Petra', 'Robin', 'ƒ 82,500 ( € 37,437)', 'Australia']
SQL:

assistant: SELECT "Runner-up" FROM "Table" WHERE "Season" = 'Season 13';