user: Question: Name the reason for change Pennsylvania 13th
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['New York 20th', 'Egbert Ten Eyck (J)', 'Lost contested election December 15, 1825', 'Daniel Hugunin, Jr. (A)', 'Seated December 15, 1825']
SQL:

assistant: SELECT "Reason for change" FROM "Table" WHERE "District" = 'Pennsylvania 13th';