user: ### NOW ANSWER:
Question: Tell me the DA for Bureau Chief ADA
Columns: ['Time Period', 'Position', 'Bureau', 'Office', 'District Attorney']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1974–1984', 'Assistant District Attorney', 'Homicide/ Special Victims', "Manhattan District Attorney's office", 'Various']
SQL:

assistant: SELECT "District Attorney" FROM "Table" WHERE "Position" = 'Bureau Chief ADA';