user: Question: What's the district that Otto Passman is the incumbent of?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Louisiana 1', 'F. Edward Hebert', 'Democratic', 1940.0, 'Re-elected', 'F. Edward Hebert (D) Unopposed']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Incumbent" = 'Otto Passman';