Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_31 (discipline VARCHAR, championship VARCHAR)
### Question:
For the USAC National Championship, what is the Discipline?
### Answer:
SELECT discipline FROM table_name_31 WHERE championship = "usac national championship"