Which driver won at the Sachsenring circuit?
CREATE TABLE table_221 (
    "Race Name" text,
    "Circuit" text,
    "Date" text,
    "Winning driver" text,
    "Constructor" text,
    "Report" text
)
SELECT "Winning driver" FROM table_221 WHERE "Circuit" = 'Sachsenring'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which driver won at the Sachsenring circuit? ### Input: CREATE TABLE table_221 (
    "Race Name" text,
    "Circuit" text,
    "Date" text,
    "Winning driver" text,
    "Constructor" text,
    "Report" text
) ### Response: SELECT "Winning driver" FROM table_221 WHERE "Circuit" = 'Sachsenring'