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

### Instruction:
Who is the opponent of game 54, which was in Los Angeles and was before day 18?

### Inputs:
table_name: table, columns: ['Game', 'Date', 'Opponent', 'Score', 'Location/attendance', 'Record']

### Response:
SELECT Opponent FROM table WHERE Location/attendance = los angeles AND Date < 18 AND Game = 54