For the USAC National Championship, what is the Discipline?
CREATE TABLE table_name_31 (
    discipline VARCHAR,
    championship VARCHAR
)
SELECT discipline FROM table_name_31 WHERE championship = "usac national championship"
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: For the USAC National Championship, what is the Discipline? ### Input: CREATE TABLE table_name_31 (
    discipline VARCHAR,
    championship VARCHAR
) ### Response: SELECT discipline FROM table_name_31 WHERE championship = "usac national championship"