user: Question: What was the role for Challenge TV?
Columns: ['Year', 'Title', 'Role', 'Episodes', 'Broadcaster']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['2003', 'Max Somerset', 'Presenter', '4', 'Game In TV']
SQL:

assistant: SELECT "Role" FROM "Table" WHERE "Broadcaster" = 'Challenge TV';