user: Question: What is the engine code for the xDrive25i?
Columns: ['Model', 'Years', 'Engine code', 'Power', 'Torque']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['sDrive18i', '2010-', 'N46B20', 'PS (kW; hp)@6400', 'N·m (lb·ft)@3600']
SQL:

assistant: SELECT "Engine code" FROM "Table" WHERE "Model" = 'xDrive25i';