user: Question: What date did the prime minister who entered office on 7 December 1916 leave office?
Columns: ['Name', 'Entered office', 'Left office', 'Political party', 'Monarchs served', 'Birth Place']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['David Lloyd George', '7 December 1916', '19 October 1922', 'National Liberal', 'George V', 'Manchester']
SQL:

assistant: SELECT "Left office" FROM "Table" WHERE "Entered office" = '7 December 1916';