CREATE TABLE table_name_15 (chassis VARCHAR, rounds VARCHAR, entrant VARCHAR)

Which chassis had Rounds of 7, and an Entrant of Ecurie Rosier?
SELECT chassis FROM table_name_15 WHERE rounds = "7" AND entrant = "ecurie rosier"
SELECT "chassis" FROM "table_name_15" WHERE "7" = "rounds" AND "ecurie rosier" = "entrant"