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_98 (rounds VARCHAR, entrant VARCHAR, driver VARCHAR)
### Question:
What rounds did Roy Salvadori drive for David Brown Corporation?
### Answer:
SELECT rounds FROM table_name_98 WHERE entrant = "david brown corporation" AND driver = "roy salvadori"