user: Question: What is Term Start, when Name is Prime Ministers 1939 - 1943?
Columns: ['Name', 'Born-Died', 'Term start', 'Term end', 'Political Party']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Prime Ministers 1939 - 1943', 'Prime Ministers 1939 - 1943', 'Prime Ministers 1939 - 1943', 'Prime Ministers 1939 - 1943', 'Prime Ministers 1939 - 1943']
SQL:

assistant: SELECT "Term start" FROM "Table" WHERE "Name" = 'Prime Ministers 1939 - 1943';