user: Question: Which Result has a District of Pennsylvania 13?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Pennsylvania 1', 'Thomas B. Florence', 'Democratic', 1848.0, 'Retired Democratic Hold']
SQL:

assistant: SELECT "Result" FROM "Table" WHERE "District" = 'Pennsylvania 13';