user: Question: Who was the incumbent when Arthur Osborne won the election?
Columns: ['Electorate', 'Incumbent', 'Winner', 'Majority', 'Runner up']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Arch Hill', 'Bill Parry', 'John Stewart', 3965.0, 'Hope']
SQL:

assistant: SELECT "Incumbent" FROM "Table" WHERE "Winner" = 'Arthur Osborne';