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_84 (rounds VARCHAR, engine VARCHAR, driver VARCHAR)
### Question:
How many rounds did satrio hermanto go with an opc-challenge engine?
### Answer:
SELECT rounds FROM table_name_84 WHERE engine = "opc-challenge" AND driver = "satrio hermanto"