user: Question: Which previous conference is associated with Penn school?
Columns: ['School', 'Location', 'Mascot', 'County', 'Enrollment IHSAA Class', 'Joined', 'Previous Conference']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Elkhart Central *', 'Elkhart', 'Blue Blazers', '20 Elkhart', '1747 AAAA', 1927.0, 'Independents']
SQL:

assistant: SELECT "Previous Conference" FROM "Table" WHERE "School" = 'Penn';