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

### Instruction:
Which constructor makes the ej15 ej15b chassis?

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

### Response:
SELECT Constructor FROM table WHERE Chassis = ej15 ej15b