Which circuit has a length of 45 minutes and is held on August 6?
CREATE TABLE table_37438 (
    "Race" text,
    "Length" text,
    "Class" text,
    "Circuit" text,
    "Date" text
)
SELECT "Circuit" FROM table_37438 WHERE "Length" = '45 minutes' AND "Date" = 'august 6'
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 circuit has a length of 45 minutes and is held on August 6? ### Input: CREATE TABLE table_37438 (
    "Race" text,
    "Length" text,
    "Class" text,
    "Circuit" text,
    "Date" text
) ### Response: SELECT "Circuit" FROM table_37438 WHERE "Length" = '45 minutes' AND "Date" = 'august 6'