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_86 (constructor VARCHAR, chassis VARCHAR, rounds VARCHAR)
### Question:
Who constructed the car in round 1 with a Chassis of 250F?
### Answer:
SELECT constructor FROM table_name_86 WHERE chassis = "250f" AND rounds = "1"