Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which chassis had Rounds of 7, and an Entrant of Ecurie Rosier?

### Inputs:
table_name: table, columns: ['Entrant', 'Constructor', 'Chassis', 'Driver', 'Rounds']

### Response:
SELECT Chassis FROM table WHERE Rounds = 7 AND Entrant = ecurie rosier