user: Question: Which constructor makes the EJ15 EJ15B chassis?
Columns: ['Entrant', 'Constructor', 'Chassis', 'Engine †', 'Tyre', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Scuderia Ferrari Marlboro', 'Ferrari', 'F2004M F2005', 'Ferrari 053 Ferrari 055', 'B', 'Michael Schumacher', 'All']
SQL:

assistant: SELECT "Constructor" FROM "Table" WHERE "Chassis" = 'EJ15 EJ15B';