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_15 (chassis VARCHAR, rounds VARCHAR, entrant VARCHAR)
### Question:
Which chassis had Rounds of 7, and an Entrant of Ecurie Rosier?
### Answer:
SELECT chassis FROM table_name_15 WHERE rounds = "7" AND entrant = "ecurie rosier"