user: Question: Which female challengers featured in episode 28?
Columns: ['Episode', 'Contest', 'Original airdate', 'Challengers (Female)', 'Challengers (Male)', 'Events']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Behind the scenes special', '5 August 1995', 'N/A', 'N/A', 'N/A']
SQL:

assistant: SELECT "Challengers (Female)" FROM "Table" WHERE "Episode" = 28.0;