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

### Instruction:
Who is the Opponent playing at 20:00 GMT at Camp Nou?

### Inputs:
table_name: table, columns: ['Date', 'Time', 'Competition', 'Opponent', 'Ground', 'Score']

### Response:
SELECT Opponent FROM table WHERE Time = 20:00 gmt AND Ground = camp nou