user: Question: What is the greatest first elected for Pennsylvania 10?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Pennsylvania 1', 'Bob Brady', 'Democratic', 1998.0, 'Re-elected']
SQL:

assistant: SELECT MAX("First elected") FROM "Table" WHERE "District" = 'Pennsylvania 10';