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

### Instruction:
Which Subregion has a No P. of 4, and a Pop/Area (1/km²) of 534?

### Inputs:
table_name: table, columns: ['Name', 'Area (km²)', 'Pop.', 'Pop/Area (1/km²)', 'No P.', 'No C./No T.', 'Subregion']

### Response:
SELECT Subregion FROM table WHERE No P. = 4 AND Pop/Area (1/km²) = 534