user: Question: Which party does the incumbent Mathias Morris belong to?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Pennsylvania 5', 'Jacob Fry, Jr.', 'Democratic', '1834', 'Retired Democratic hold', 'Joseph Fornance (D) 54.9% Joseph Royer (W) 45.1%']
SQL:

assistant: SELECT "Party" FROM "Table" WHERE "Incumbent" = 'Mathias Morris';